Nasal delivery

ABSTRACT

A nasal delivery device for and method of delivering a substance, preferably comprising oxytocin, non-peptide agonists thereof and antagonists thereof, preferably as one of a liquid, as a suspension or solution, or a powder, to the nasal airway of a subject, preferably the posterior region of the nasal airway, and preferably the upper posterior region of the nasal airway which includes the olfactory bulb and the trigeminal nerve, and preferably in the treatment of neurological conditions and disorders.

The present invention relates to a nasal delivery device for and amethod of delivering a substance comprising oxytocin, non-peptideagonists thereof and antagonists thereof, in particular as one of aliquid, as a suspension or solution, or a powder, to the nasal airway ofa subject, in particular the posterior region of the nasal airway, andin particular the upper posterior region of the nasal airway, whichincludes the olfactory bulb and the trigeminal nerve, in particular inthe treatment of neurological conditions and disorders.

Referring to FIG. 1, the nasal airway 1 comprises the two nasal cavitiesseparated by the nasal septum, which airway 1 includes numerous ostia,such as the paranasal sinus ostia 3 and the tubal ostia 5, and olfactorycells, and is lined by the nasal mucosa. The nasal airway 1 cancommunicate with the nasopharynx 7, the oral cavity 9 and the lowerairway 11, with the nasal airway 1 being in selective communication withthe anterior region of the nasopharynx 7 and the oral cavity 9 byopening and closing of the oropharyngeal velum 13. The velum 13, whichis often referred to as the soft palate, is illustrated in solid line inthe closed position, as achieved by providing a certain positivepressure in the oral cavity 9, such as achieved on exhalation throughthe oral cavity 9, and in dashed line in the open position.

The posterior region of the nasal airway is that region which isposterior of the nasal valve NV, as illustrated in FIG. 2. The nasalvalve comprises the anterior bony cavum which contains inferiorturbinate erectile tissue and septal erectile tissue, which aresupported respectively by compliant ala tissue and the rigidcartilaginous septum (Cole). These elements combine to form a dynamicvalve, which extends over several millimetres, that adjusts nasalairflow, and is stabilized by cartilage and bone, modulated by voluntarymuscle and regulated by erectile tissue. The lumen of the nasal valve isthe section of narrowest cross-sectional area between the posterior andanterior regions of the nasal airway, and is much longer and narrowerdorsally than ventrally, and this lumen defines a triangular entrancewhich extends to the piriform region of the bony cavum. The nasal valveis lined in its anterior part with transitional epithelium, with agradual transition posterior to respiratory epithelium. The nasal valveand anterior vestibule define roughly the anterior one-third of thenose.

The posterior region of the nasal airway is that region which is linedwith respiratory epithelium, which is ciliated, and olfactoryepithelium, which comprises nerves which extend downwards through thecribiform plate CP from the olfactory bulb, whereas the anterior regionof the nasal airway is that region which is lined with squamousepithelium, which is not ciliated, and transitional epithelium. Theolfactory epithelium extends on both the lateral and medial sides of thenasal airway, and typically extends downwards about 1.5 to 2.5 cm.

The upper posterior region is the region above the inferior meatus IM,as illustrated in FIG. 2, and encompasses the middle turbinate, themiddle meatus, the sinus ostia in infundibulum (ostia to maxillary,frontal and ethmoidal sinuses), the olfactory region, and the upperbranches of the trigeminal nerve, and is that region which includesveins which drain to the venous sinuses that surround the brain.

As illustrated in FIG. 2, the posterior region of the nasal airway isthe nasal region posterior of an imaginary vertical plane VERT which islocated at a position corresponding to the lower angle of the anteriornasal aperture (aperture piriformis), which corresponds substantially toone-quarter of the distance between the anterior nasal spine AnS, whichis a pointed projection at the anterior extremity of the intermaxillarysuture, and the posterior nasal spine PnS, which is the sharp posteriorextremity of the nasal crest of the hard palate and represents thetransition between the nose and the nasopharynx, which corresponds to adistance posterior of the anterior nasal spine AnS of between about 13mm and about 14 mm (Rosenberger defines the distance between theanterior nasal spine AnS and the posterior nasal spine PnS as being 56mm in eighteen year old boys and 53.3 mm in eighteen year old girls).

As further illustrated in FIG. 2, the upper region of the nasal airwayis an upper segment of the nasal airway which is bounded by thecribiform plate CP and a horizontal plane HORIZ which is located at aposition corresponding to one-third of the distance between the nasalfloor NF of the nasal airway and the cribiform plate CP, whichcorresponds to a height of typically between about 13 and about 19 mmabove the nasal floor NF (Zacharek eta/define the distance from thenasal floor NF to the cribiform plate CP as 46+/−4 mm).

The upper posterior region is thus that upper posterior region which isbounded by the above-defined vertical and horizontal planes VERT, HORIZ.

The present invention is directed to the delivery of a substance to thenasal airway of a subject, particularly in the treatment of neurologicalconditions and disorders, using the delivery technique ofWO-A-2000/051672 and WO-A-2003/000310, the contents of which are eachherein incorporated by reference.

WO-A-2000/51672 and WO-A-2003/000310 disclose delivery devices fordelivering a substance, in particular a medicament, in a bi-directionalflow through the nasal cavities, that is, an air flow which passes intoone nostril, around the posterior margin of the nasal septum and in theopposite direction out of the other nostril.

The nasal delivery technique of the present invention provides fordelivery to the olfactory region, the trigeminal nerve and otherstructures of the limbic system which interface at the nasal airway,which features are located in the superior region of the nasal cavitiesand represents the only region where it is possible to circumvent theblood-to-brain barrier (BBB) and enable communication with thecerebrospinal fluid (CSF) and the brain.

In one embodiment the substance is delivered as a powder, preferablycontaining from about 1 IU to 100 IU, more preferably from about 5 IU toabout 80 IU, still more preferably from about 5 IU to about 50 IU, yetmore preferably from about 5 IU to about 20 IU, still more preferablyfrom about 20 IU to about 100 IU, yet more preferably from about 40 IUto about 100 IU, and preferably less than about 15 IU or greater thanabout 50 IU.

In one embodiment the active ingredient is mixed with a bulking agent,such as lactose.

In one embodiment the substance includes a thickening agent, whichthickens following delivery and on exposure to a moist environment, suchas in the nasal airway, thereby providing for increased residency at thetarget region.

In one embodiment the thickening agent comprises pectin, agar-agar,lignin, algin, gums, such as vegetable gums, and cellulose.

In one embodiment the substance can be delivered as a powder, followedby application of a liquid, typically as a liquid spray, to promotedissolution and transfer of the active ingredient.

In another embodiment the substance is delivered as a liquid, preferablycontaining from about 1 IU to about 10 IU, more preferably from 3 IU to10 IU, still more preferably from about 3 IU to about 5 IU or greaterthan 5 IU.

In one embodiment the substance is delivered in a once-dailyadministration.

In another embodiment the substance is delivered in a twice-dailyadministration.

In one embodiment the active ingredient comprises oxytocin.

In another embodiment the active ingredient comprises a non-peptideoxytocin agonist, such as WAY-267,464.

In one embodiment the active ingredient can comprise both peptide andnon-peptide oxytocin.

In a further embodiment the active ingredient comprises an oxytocinantagonist.

In other embodiments the active ingredient can instead be an analogue orderivative or oxytocin, such as carbetocin or demoxytocin.

In one embodiment the administration can be targeted to provide for bothN2B and systemic delivery.

In one embodiment the substance can be formulated selectively to providefor greater N2B or systemic delivery.

In another embodiment the substance can comprise two substancecomponents, one formulated for N2B delivery and the other formulated forsystemic delivery.

In one embodiment the substance comprises a decongestant, such asoxymetazoline.

The nasal delivery technique of the present invention provides for thetreatment of neurological diseases and conditions, including:neurodegenerative diseases and conditions, including Alzheimer'sdisease, Huntington's disease, Parkinson's disease, dementia and stroke,bi-polar disorder, diabetes, neuropsychiatric disorders, including OCD,autism, eating disorders, addiction, schizophrenia, psychosis, PTSD,depression, chronic depression, disorders associated with abuse and mooddisorders, promoting well-being, promoting overall calm, anxiety,including modulating anxiety, increasing trust, reducing fear, hairloss, cancer, obesity, atherosclerotic cardiovascular disease, essentialhypertension, polycystic ovary syndrome, syndrome X, ischemia,especially cerebral ischemia, traumatic brain injury, immunodeficiency,sexual dysfunction, promoting an orgasm, regulation of maternalbehaviour, including mother-infant bonding, regulation of sexualbehaviour, including regulation of female sexual behaviour andregulation of male sexual behaviour, promoting social behaviour,including regulation of social behaviour, including regulation of maleand female aggression, promoting social memory, including socialrecognition, love bonding and pair bonding, promoting socialrecognition, promoting intelligence, including non-verbal intelligence,promoting learning, promoting memory, promoting cognition, loweringsympathoadrenal tone (“flight and fight response”), enhancing digestiveactivity, enhancing anabolic activity, decreasing blood pressure,inhibiting salt-appetite, and improving wound healing.

In other embodiments the nasal delivery technique of the presentinvention provides for suppression of fever, and by way of pain relief,such as in the treatment of breakthrough pain, for example, in cancerpatients.

Differently from oral delivery techniques which utilizegastro-intestinal (GI) absorption and exhibit a high first-passmetabolism, the delivery technique of the present Invention avoids thiseffect, thus delivering more substance to the blood.

The delivery technique of the present invention, which provides fornose-to-brain (N2B) delivery, enables the delivery of substances to thebrain in an amount significantly higher than other conventional deliveryroutes, such as that achieved by the oral route.

Finally, it will be understood that the present invention has beendescribed in its preferred embodiments and can be modified in manydifferent ways.

REFERENCES

-   1. Cole, P, The Respiratory Role of the Upper Airways, a selective    clinical and pathophysiological review. 1993, Mosby-Year Book Inc.    ISBN.1.55664-390-X.-   2. Rosenberger, H, Growth and Development of the Naso-Respiratory    Area in Childhood, PhD Thesis, Laboratory of Anatomy, School of    Medicine, Western Reserve University, Presented to the Annual    Meeting of the American Laryngological, Rhinological and Otological    Society, Charleston, S.C., USA, 1934.-   3. Zacharek, M A et al, Sagittal and Coronal Dimensions of the    Ethmoid Roof: A Radioanatomic Study, Am J Rhinol 2005, Vol 19, pages    348 to 352.

The present invention relates to a delivery device for and a method ofdelivering a substance, in particular one of a liquid, as a suspensionor solution, or a powder containing a medicament, especially a topicalpharmaceutical, a cleansing agent, or an irrigating agent, as a liquid,preferably combined with a cleansing agent, to the nasal airway of asubject. In particular, the present invention relates to the delivery ofmedicament to and the irrigation of the nasal mucosa, the anteriorregion of nasopharynx, the paranasal sinus ostia, the tubal ostia of theauditory tubes, the sinus tubes, the auditory tubes, the tympaniccavities and the paranasal sinuses.

Referring to FIG. 3, the nasal airway 1 comprises the two nasal cavitiesseparated by the nasal septum, which airway 1 includes numerous ostia,such as the paranasal sinus ostia 3 and the tubal ostia 5, olfactorycells and is lined by the nasal mucosa. The nasal airway 1 cancommunicate with the nasopharynx 7, the oral cavity 9 and the lowerairway 11, with the nasal airway 1 being in selective communication withthe anterior region of the nasopharynx 7 and the oral cavity 9 byopening and closing of the oropharyngeal velum 13. The velum 13, whichis often referred to as the soft palate, is illustrated in solid line inthe closed position, as achieved by providing a certain positivepressure in the oral cavity 9, such as achieved on exhalation throughthe oral cavity 9, and in dashed line in the open position.

There are many nasal conditions which require treatment. One suchcondition is nasal inflammation, specifically rhinitis, which can beallergic or non-allergic and is often associated with infection andprevents normal nasal function. By way of example, allergic andnon-allergic inflammation of the nasal airway can typically effectbetween 10 and 20% of the population, with nasal congestion of theerectile tissues of the nasal concha, lacrimation, secretion of waterymucus, sneezing and itching being the most common symptoms. As will beunderstood, nasal congestion impedes nasal breathing and promotes oralbreathing, leading to snoring and sleep disturbance. Worryingly, theincidence of such allergic and non-allergic inflammatory diseases isincreasing. Other nasal conditions include nasal polyps which arise fromthe paranasal sinuses, hypertrophic adenoids, secretory otitis media,sinus disease and reduced olfaction.

In the treatment of certain nasal conditions, the topical administrationof medicaments is preferable, particularly where the nasal mucosa is theprime pathological pathway, such as in treating or relieving nasalcongestion. Indeed, topical administration is advantageous in minimisingthe possible side effects of systemic administration. Medicaments thatare commonly topically delivered include decongestants, anti-histamines,cromoglycates, steroids and antibiotics.

There are now an increasing number of adults and children who rely onpharmaceuticals to relieve symptoms associated with nasal conditions. Atpresent, among the known anti-inflammatory pharmaceuticals, topicalsteroids have been shown to have an effect on nasal congestion. Topicaldecongestants have also been suggested for use in relieving nasalcongestion. The treatment of hypertrophic adenoids and chronic secretoryotitis media using topical decongestants, steroids and anti-microbialagents, although somewhat controversial, has also been proposed.Further, the topical administration of pharmaceuticals has been used totreat or at least relieve symptoms of inflammation in the anteriorregion of the nasopharynx, the paranasal sinuses and the auditory tubes.

Aside from the delivery of medicaments, the irrigation of the nasalmucosa with liquids, in particular saline solutions, is commonlypractised to remove particles and secretions, as well as to improve themucociliary activity of the nasal mucosa. These solutions can be used incombination with active pharmaceuticals.

Furthermore, medicaments are now increasingly systemically deliveredthrough the nasal pathway, the nasal pathway offering a goodadministration route for the systemic delivery of pharmaceuticals, suchas hormones, for example oxytocin, and anti-migraine compositions, asthe high blood flow and large surface area of the nasal mucosaadvantageously provides for rapid systemic uptake.

A variety of delivery systems have been developed to deliver substancesto the nasal airways of subjects.

Conventionally, spray bottles have been used to deliver amedicament-containing liquid or an irrigating liquid to the nasalairways of subjects. However, the distribution of the deliveredsubstance, in particular to the posterior region of the nasal airway, isless than ideal, especially in the cases of moderate and severe nasalobstruction. This poor distribution is often further exacerbated by asubject inhaling through the nasal airway during delivery, as is oftenprescribed, in an attempt to deliver the substance to the posteriorregion of the nasal airway. Indeed, an amount of the substance can bedrawn into the lungs or swallowed in each delivery, which could beproblematic in paediatric subjects if the medicament is a potentpharmaceutical, such as a steroid, which has to be administeredfrequently. In addition, the spray is frequently directed against thenasal septum which can undesirably lead to localised deposition.Further, the mechanical action of the delivery mechanism of the spraybottles can cause irritation and bleeding.

GB-A-408856 discloses a delivery device, which in one mode of use,apparently allows for the delivery of two separate air flows entrainingmedicament into respective ones of the nasal cavities of a subject. Thisdelivery device comprises a chamber containing a sponge saturated withmedicament, a mouthpiece connected to the chamber and first and secondnosepieces connected to the chamber. In one mode of use, the mouthpieceis taken in the mouth of a subject and the nosepieces fitted intorespective ones of the nostrils of the subject, and on exhalationthrough the mouthpiece separate air flows entraining medicament areapparently driven into the nasal cavities of the subject.

It is not seen, however, how this delivery device could functionproperly in this mode of use, since, as is now understood, the velum ofthe subject would close on exhalation through his or her mouth and henceclose the nasal airway, thereby preventing any significant air flow intothe nasal cavities.

WO-A-98/53869 discloses a delivery device for delivering a powdercontaining a medicament to the nasal mucosa in one of the nasal cavitiesof a subject. This device comprises a tubular section which contains ametered dose of powdered medicament. In use, the ends of the tubularsection are respectively located in the nostril of one of the nasalcavities and the mouth of a subject, and on exhalation by the subjectthrough his or her mouth the exhaled air entrains the powderedmedicament and delivers the same into the one nasal cavity, with theexhaled air backflowing out of the one nostril around the tubularsection. In one embodiment the tubular section includes a flexibleportion upstream of the dose of powdered medicament. The provision ofthis flexible portion allows the subject to close the tubular section ata point upstream of the medicament, such that, on release of the closedflexible portion during exhalation, a short explosive air flowentraining medicament is delivered into the one nasal cavity. In anotherembodiment the end of the tubular section located in the nostril can beshaped to act to locate the tubular section in a position in the nostrilwhich allows for the deposition of the powdered medicament on the nasalmucosa.

Whilst this delivery device is simple in construction, the operation ofthe device still does not provide for the effective delivery ofsubstances, in particular one of a liquid or powder containingmedicament, to the posterior region of the nasal airway, sincemedicament is delivered separately to each of the nasal cavities and theair flow into and out of each nasal cavity is through the same opening,namely the respective nostril, with the closed posterior region of therespective nasal cavity acting as a pressure reflecting surface whichcauses the exhaled air to backflow out of the one nostril before everadequately reaching the posterior region of the respective nasal cavity.Further, in providing a short explosive burst of air flow into one ofthe nasal cavities, it is not possible to achieve a sustained andcontrolled bi-directional air flow through the nasal cavities which hasbeen found necessary to deliver a substance effectively to the posteriorregion of the nasal airway.

For any substance to be delivered effectively to the nasal airway, it ishighly desirable that the administration is efficient and simple.However, there can be problems in attempting to achieve this goal. Inparticular, the pathological changes observed with nasal inflammationmake administration of substances, such as liquids or powders, tricky,particularly to the posterior region of the nasal airway and theposterior margins of the nasal structures. Indeed, as a consequence ofthe complex geometry of the narrow slit-like passages in the nasalairway, these passages become partially occluded when the nasal mucosais inflamed and congested, making the distribution of topicalpharmaceuticals to the nasal airway difficult.

It is thus an aim of the present invention to provide a delivery devicefor and a method of achieving a more optimally distributed deposition ofa substance, especially topical pharmaceuticals, in the nasal airway,particularly the posterior region of the nasal airway, and in particularthe anterior region of the nasopharynx where the adenoid and tubal ostiaare located.

Accordingly, the present invention provides a delivery device fordelivering a substance to the nasal airway of a subject, comprising: aclosure unit for causing the closure of the oropharyngeal velum of thesubject; and a delivery unit for delivering a gas flow entraining asubstance to one of the nostrils of the subject at such a drivingpressure as to flow around the posterior margin of the nasal septum andout of the other nostril of the subject, wherein the delivery unitcomprises a nosepiece which includes an outlet through which the gasflow is in use delivered to the one nostril and a sealing member forsealing the one nostril to the outlet such as in use to prevent theescape of the gas flow through the one nostril.

In one embodiment the substance comprises a dry powder.

In another embodiment the substance comprises liquid droplets.

Preferably, the particle size distribution of the substance isprincipally in the range of about 1 to 10 μm.

In one embodiment the substance contains a medicament, particularly forthe treatment of a nasal condition. In a preferred embodiment theparticle size distribution of the substance can include a smallerfraction of larger particles, typically in the range of about 10 to 30μm, and preferably in the range of about 20 to 30 μm.

In other embodiments the substance can be a cleansing agent, as a powderor liquid, for cleansing the nasal airway, or a liquid, which maypreferably contain a cleansing agent, for irrigating the nasal airway.By way of example, the delivery device could be used to administersaline or other solutions to the nasal airway to remove particles andsecretions, in particular from the posterior region of the nasal airway,which resulting solution could be analysed for diagnostic or researchpurposes. In a preferred embodiment the particle size distribution ofthe cleansing or irrigating agents can include a fraction of largerparticles, particularly in relation to the mechanical action of theparticles.

The present invention also provides a method of delivering a substanceto the nasal airway of a subject, comprising the steps of: sealing oneof the nostrils of a subject to an outlet of a delivery unit such as toprevent the escape of a gas flow through the one nostril; closing theoropharyngeal velum of the subject; and delivering a gas flow entraininga substance through the outlet at such a pressure as to flow around theposterior margin of the nasal septum and out of the other nostril of thesubject.

In one embodiment the closure of the velum is achieved directly by theuse of an instrument for pressing against the velum to close the same ora bung for temporarily closing the opening behind the velum between thenasal airway and the oral cavity.

In a preferred embodiment the closure of the velum is achievedindirectly by the creation of a positive pressure in the oral cavity, ormore correctly a positive pressure differential between the oral cavityand the nasal airway, such as achieved on exhalation.

Preferably, the velum is closed simultaneously with the onset of thedelivery of the substance to the nasal airway.

In a preferred embodiment closure of the velum is achieved automaticallyby the subject exhaling against a flow resistor, which flow resistor maybe operably connected to a tubular section held between the lips of thesubject. The flow resistor can be configured to provide the requiredintra-oral positive pressure.

It has been established that flow rates of about 1 to 20 litres perminute, and particularly about 3 to 15 litres per minute, can be easilyachieved by a subject and that and a fairly constant air flow can bemaintained for up to 20 seconds depending on the flow rate. For sometreatment regimes, it is important that a stable flow of relatively highflow rate be maintained for a period of a few seconds, preferably 3 to10 seconds, in order to enable the substance to penetrate to the moreremote parts of the nasal airway.

In one embodiment the air flow of exhalation by a subject is used topower a mechanism which disperses the substance into a volume of air anddelivers that dispersed substance into the nasal airway.

Preferably, the mechanism is so arranged that the substance is deliveredinto the nasal airway after the velum has been closed or simultaneouslywith velum closure. In this respect, it will be understood thatbi-directional flow through the nasal cavities is possible only when thevelum is closed and that any substance delivered prior to closure of thevelum would undesirably be delivered to the lower airway or the gut.

Preferably, the release of the substance into the nasal airway istriggered by the air flow created on exhalation.

In a preferred embodiment a pressure-sensitive valve is utilised totrigger release of the substance when a predetermined flow rate has beendeveloped. It should be understood that control of the flow rate of thegas in which the substance is delivered is important, as this flow rate,along with the particle size distribution of the substance, are thesignificant factors determining the particle deposition efficiency.

In a preferred embodiment the pressure-sensitive valve is not openeduntil the subject has maintained a predetermined flow rate, and can beclosed when the flow rate drops below the predetermined flow rate so asto stop the delivery of the substance.

In a preferred embodiment, where medicament is delivered in a drivinggas, one or both of the timing and duration of the opening of thepressure-sensitive valve and the dose released are carefully controlledto ensure a standardised dosage.

In one embodiment, where the substance is released into a chamber and agas flow, in one embodiment the exhalation flow, is provided to inducethe mixing of a metered dose of the substance, the delivery of the gasflow can be prolonged to flush the nasal airway as this prolongedflushing does not effect the delivered dose. A mechanical device poweredby a hand-chargeable spring, pressurised air or similar, may be used toprovide the driving gas.

Regardless of the system employed, the flow characteristics can beoptimised to improve the deposition of the substance and the comfortfactor, such as to avoid an abrupt onset which is likely to inducewithdrawal reflexes.

Preferably, a metered dose of the substance is dispensed into a deliverychamber by a dosing mechanism. This dosing mechanism can be constructedin such a way as to allow for a gradual release of the substance. Thisgradual release will better enable the substance to be entrained by thegas flow and thereby improve delivery to all ventilated parts of thenasal airway, in particular in the contralateral nasal cavity.

In a preferred embodiment the exhalation air flow developed by thesubject, which closes the velum, provides the gas flow for entrainingthe substance and providing the bi-directional flow. This configurationis advantageous in that a separate driving gas flow need not bedeveloped.

Preferably, the nosepiece is configured to extend about 1 cm into theone nasal cavity so as to expand the valve region, a region locatedabout 2 to 3 cm within a nasal cavity which is usually the flow limitingregion, and reduce the resistance which may be high in the case of nasalinflammation.

The shape of the nosepiece can be tailored to suit specific needs. Forexample, the internal shape of the nosepiece may be optimised to promoteturbulence and achieve a more optimal dispersion of the substance.

The nosepiece may include a tight fitting nasal olive, which can aid thecreation of a suitable physiological gas flow. The olive may bedetachable such as to allow for other olives of the same or differentdimensions to be fitted. In the case of severe nasal obstruction, anasal olive can be introduced into the other nostril to reduceresistance and facilitate flow therethrough.

As mentioned above, a gas flow of at least 20 litres per minute caneasily be achieved by the delivery device. By providing a sufficientlyhigh gas flow, all parts, or at least a larger part, of the complexnasal airway can be penetrated by the substance. In one embodiment thedelivery device can include an indicator for indicating the magnitude ofthe gas flow.

The dimensions of the posterior passage and opening behind the nasalseptum are almost always larger than the opening in the flow resistor.Thus, it is only in very rare cases of complete occlusion of the outletnostril that the pressure in the posterior region of the nasal airwaywill approach the positive pressure in the oral cavity and jeopardisethe velum closure. In the case of severe obstruction, insertion of thenosepiece in the occluded nostril may reduce the resistance and allowsuccessful flushing.

After having flushed the nasal airway in one direction, the sameprocedure can be repeated from the other nostril. In this way both nasalcavities are irrigated in both directions. This is a unique feature ofthis device. This embodiment secures an improved distribution of thesubstance to all parts of the nasal mucosa, and in particular to theposterior region which is difficult to access using current techniques.

In a preferred embodiment, where the substance is in solid form, such asa powder, then a filter can be employed if high humidity represents aproblem for administration of the solid.

The substance can be a single compound or a mixture of compounds, whichcompounds can be in any suitable form, such as a powder form, asolution, or a suspension.

The substance can be any suitable substance for delivery to a human orin some cases an animal. The substance may be for delivery for action inany part of the nasal airway, or in any of the surrounding tissues ororgans. Also, the substance may be for delivery for action in a regionremote from the nasal airway.

Preferably, the substance is for delivery for subsequent action in anypart of the nasal airway, or in any of the surrounding tissues ororgans.

The substance may have a beneficial medical effect, which can include adiagnostic effect, a therapeutic effect, a prophylactic effect, and acleansing effect such as the removal of particles, crusts, secretions,debris, etc. Preferably, the substance has a therapeutic effect.

Preferably, the substance is a pharmaceutical. The pharmaceutical can beadmixed with any suitable carrier, diluent, excipient or adjuvant.

Preferably, the pharmaceutical is for the treatment of any one or moreof the above-mentioned conditions. By way of example, the pharmaceuticalmay be for the treatment of any allergic and non-allergic inflammatorydisease.

Typical pharmaceuticals for administration include, but are not limitedto, steroids, anti-histamines, cromoglycates, anti-allergicpharmaceuticals, anti-inflammatory pharmaceuticals, anti-leucotriens,lactation promoters such as oxytocin, and anti-migraine pharmaceuticals.

By achieving a more optimal delivery, the delivery device of the presentinvention improves the effect of topical pharmaceuticals in thetreatment of upper airway pathologies, such as hypertrophic adenoids andchronic sectretory otitis media.

Aside from pharmaceuticals, the device can also be used to irrigate orcleanse the nasal airway with saline or other solutions, preferablycontaining oils or herbs.

The device of the present invention can be tailored to suit particularneeds. For example, balloons or pop-up figures can easily be integratedto provide a semi-quantitative indication of the flow rate and toimprove the acceptability and ease of administration in small children.

Only in the rare circumstances when the nasal resistance is too high toachieve a gas flow through the nasal airway, even after attempting toexpand the nasal cavities, would insufflation be jeopardised. In thosecases, pre-treatment with decongestants may be necessary.

The delivery device may also be used as a nasal lavage means in thecollection of mediators and cells that originate from the nasal mucosafor, for example, diagnostic analysis or research purposes. In thisrespect, the mediators and cells can be expelled into a suitablecollecting vessel after the nasal airway has been exposed to a suitablesolution, such as a saline solution, for a sufficient period of time toensure sufficient transfer of the mediators and cells into the solution.This use of the device may require the use of a gas flow separate to theexhaled air flow as the flow used to flush the nasal airway. For thislavage purpose, use of the exhaled air may not be possible as the lowerairways may contain mediators, secretions and cells originating from thelower airways which would contaminate the nasal sample. For thisparticular use, and as indicated, the fluid escaping from the outletnostril may be collected in a vessel. Alternatively, the fluid escapingfrom the outlet nostril may be absorbed onto a filter for direct ordelayed analysis. Indeed, such filters and the like may even yield analmost immediate detection result of certain organisms, such asbacteria, viruses or mediators.

The delivery device of the present invention is advantageous for anumber of reasons.

Notably, the delivery device provides a very simple and efficient meansof delivering substances, such as pharmaceuticals, saline solutions,etc., into the nasal airway. In this respect, the device utilises verysimple technology with few movable parts, making the device relativelyinexpensive to mass produce. In addition, the device of the presentinvention can be made in a disposable form, thus avoiding the need forthe delivered substance to include any preservatives.

The present invention also eliminates the need for the subsequentflushing or spraying methods that are associated with some of the priorart devices. However, for some applications it may still be desirable toperform a subsequent flushing or spraying operation.

The delivery device of the present invention is advantageous as, in use,the tight seal between the nosepiece and the one nostril ensures aprolonged penetration of the complex nasal airway, a bi-directional gasflow through the nasal cavities and deposition of the substance in thecontralateral nasal passage.

In accordance with the present invention, closure of the velum willnormally be maintained. The delivered gas flow enters one nasal cavity,passes beyond the posterior margin of the nasal septum, making a 180degree turn behind the posterior margin of the nasal septum, and passesout the other nasal cavity. This re-direction of the gas flow results ina better deposition of substance, notably pharmaceuticals, to theposterior regions of the nasal turbinates and the nasal mucosa.

In addition, the bi-directional deposition of substances, typicallypharmaceuticals, and irrigation will also better reach all sinus ostiadue to the anatomic locations and orientation of the sinus ostia, whichcan improve sinus ventilation and drainage which is essential to treatsinusitis and frequently accompanies inflammation of the nasal mucosa.In this respect, the ostia and tubes to the ethmoidal and sphenoidalsinuses are located in the posterior region of the nasal airway and theuncinate projections covering the infundibulum, housing the maxillary,frontal and anterior ethmoid ostia, are tilted backwards. Furthermore,the driving positive pressure used will increase the deposition ofpharmaceuticals at the sinus ostia, the sinus tubes leading into thesinuses and even in the sinuses themselves.

In addition, the 180 degree re-direction of the flow behind the nasalseptum particularly increases the deposition of substance on the roof ofthe nasopharynx where the adenoid is located and in proximity to thelocation of the tubal ostia to the auditory tubes connecting thenasopharynx and the middle ears. By way of example, steroids have beenshown to reduce the size of hypertrophic adenoids which are commonlyfound in paediatric subjects and can have a positive effect on secretoryotitis media. Deposition of topical decongestants closer to the tubalostia may also more efficiently decongest the auditory tubes and relievethe negative pressure in the middle ears which accompanies rhinitis andpredisposes paediatric subjects to secretory otitis media and theconsequential reduced hearing. Surgery for enlarged adenoids isfrequently performed in children and the improved medical therapy of thepresent invention should reduce the necessity for surgery.

A further advantage is that possible surplus substance, that is,substance which is not deposited, will be expelled out of thecontralateral nostril, where it may be collected, if desired, andconsequently not continue to the oral cavity and down into the gut as isthe case with many other delivery techniques. In this way, thediscomfort, and more importantly, the undesirable systemic exposure tothe substance, where the substance is a medicament, will be reduced.

Also, with the present invention, irrigation by saline or othersolutions can be performed more efficiently and with less spill anddiscomfort than the current techniques used for irrigation and flushingof the nasal airway.

Further, the present invention provides for simple and comfortableirrigation of the nasal mucosa with solutions, such as saline solutions,and other oils to remove secretions from the nasal mucosa and promotemucocilary function.

Still further, the present invention provides a simple and effectivemeans for the lavage of the nasal mucosa, such as to collect anddiagnose mucosal entities, such as bacteria, viruses, cell componentsand inflammatory mediators.

Still yet further, the exposure of the nasal mucosa to a positivepressure, particularly a dynamic positive pressure, will open thenarrow, and sometimes occluded, parts of the nasal passages, rather thancause a dynamic collapse which may happen during sniffing andinhalation. The dynamic positive pressure is at least 5 cm H₂O,preferably at least 50 cm H₂O, more preferably at least 100 cm H₂O,still more preferably at least 200 cm H₂O, yet more preferably 400 cmH₂O and still yet more preferably 500 cm H₂O. The dynamic positivepressure achieved by the present invention can be contrasted with thestatic pressure provided by the Valsalva procedure where there is noflow through the nasal airway.

In addition, the use of warm and humid air as the gas flow is likely tobe better tolerated and cause less irritation than room air or outdoorair, especially in cold climates.

Where the substance is a dry powder, then the humidity of the exhaledair may, in some instances, cause agglomeration of the powder.Naturally, this will depend on the properties of the powder and theconstruction of the device, in particular the dispersion chamber. Inorder to alleviate this specific problem, the surface properties of thepowder could be modified, or the device could include amoisture-absorbing element, typically containing a desiccant such assilica, disposed upstream of the dispersion chamber. In a preferredembodiment the moisture-absorbing element could be provided as a filterwhich acts as the flow resistor.

In a preferred embodiment, in order to ensure that agglomeration ofpowder would not impede the use of direct insufflation of warm, humidexhaled air, the delivery device comprises transfer means which createsa gas flow of drier air, such as atmospheric air, as the delivery flowto the nasal airway. Such transfer means, which could be mechanical innature, utilises the energy of the exhaled air to drive the atmosphericroom air at the required flow rate, if necessary, to disperse thesubstance in the delivered air flow. In this embodiment agglomerationwill be prevented or at least reduced to the same level as currentlyexhibited by dry powder inhalers.

If desired, the distribution of the substance delivered to the nasalairway could be studied using standard techniques. By way of example,use could be made of acoustic rhinometry or coloured fluids. Thedistribution of the delivered substance could even be determined byvideo endoscopy. In addition, or in the alternative, distributionstudies could also be performed by using appropriate radioactivematerials and following the passage in the nasal cavities. The resultsof these studies could be used to optimise the flow rate, the shape ordimension of the device, in particular the nosepiece geometry, and theparticle size distribution of the substance. The results of thesestudies could even be used to optimise subject acceptance.

As already indicated, the delivery device may include a balloon or asimilar pop-up device for indicating that the desired positive pressurehas been attained, which balloon or pop-up device may improve thecompliance in small children who are reluctant to use the device.

Alternatively, for particularly young children, the entraining gas flowcan be provided by the exhalation air flow of another person, such as aparent, or even by the use of a pump or the like, while the childcreates the required positive pressure in the oral cavity by inflating aballoon or pop-up device.

Preferred embodiments of the present invention will now be describedhereinbelow by way of example only with reference to the accompanyingdrawings, in which:

FIG. 3 schematically illustrates the anatomy of the upper respiratorytract of a human subject;

FIG. 4 schematically illustrates a delivery device in accordance with afirst embodiment of the present invention;

FIG. 5 schematically illustrates a delivery device in accordance with asecond embodiment of the present invention;

FIG. 6 schematically illustrates a delivery device in accordance with athird embodiment of the present invention;

FIG. 7 schematically illustrates a modified delivery unit for theabove-described first to third embodiments of the present invention;

FIG. 8 schematically illustrates a delivery device in accordance with afourth embodiment of the present invention;

FIG. 9 schematically illustrates a delivery device in accordance with afifth embodiment of the present invention;

FIG. 10 schematically illustrates a delivery device in accordance with asixth embodiment of the present invention; and

FIG. 11 schematically illustrates a delivery device in accordance with aseventh embodiment of the present invention.

FIG. 4 illustrates a delivery device in accordance with a firstembodiment of the present invention.

The delivery device comprises an oral exhalation unit 20 and a substancedelivery unit 22. In this embodiment the oral exhalation unit 20 and thedelivery unit 22 are provided as separate components, but alternativelycould be detachably coupled, for example by means of Velcro™ fasteners,connected, for example by means of screws and/or rivets, or evenintegrally formed.

The oral exhalation unit 20 comprises a tubular section 24 and amouthpiece 26 attached to one end of the tubular section 24. Themouthpiece 26, which in use is gripped in the lips of a user, is formedseparately of the tubular section 24 to allow for replacement, but couldalternatively be integrally formed. In this embodiment the mouthpiece 26is a snap fit on the tubular section 24, but could equally be a screwfit. The tubular section 24 includes a flow resistor 28, in thisembodiment a fixed baffle plate, configured to provide a sufficientresistance to exhalation therethrough by a subject as to cause thegeneration of a positive pressure in the oral cavity of the subject andthe closure of the velum on exhalation by the subject. In alternativeembodiments the flow resistor 28 could be a movable member, such as abiased flap, a resilient membrane or a damped wheel.

The delivery unit 22 comprises a nosepiece 30, in this embodiment formedof a resilient material such as a polymeric material, for providing atight sealing fit in one of the nostrils of the subject, a medicamentsupply unit 32 for supplying a gas flow entraining medicament at apredetermined pressure sufficient to open a flow path beyond theposterior margin of the nasal septum when delivered into one of thenasal cavities of the subject, and a tubular section 34 coupling thenosepiece 30 and the medicament supply unit 32. In a preferredembodiment the nosepiece 30 can include an external olive or be shapedto cause the anterior region of the nasal cavity into which thenosepiece 30 is inserted to be enlarged. In a particularly preferredembodiment the nosepiece 30 can be shaped, for example by includingswirl-inducing projections, to provide the exiting gas flow with anoptimal flow pattern and particle size distribution. The nosepiece 30 isformed separately of the tubular section 34 to allow for replacement,but could alternatively be integrally formed. In this embodiment thenosepiece 30 is a snap fit on the tubular section 34, but could equallybe a screw fit. The medicament supply unit 32 can comprise an aerosolspray generator for generating an aerosol spray of liquid dropletscontaining medicament, such as provided by a pressurised metered doseinhaler, or a pressurised gas source for entraining a metered dose of adry powder containing medicament loaded thereinto, which powder couldalternatively be loaded into a compartment in the tubular section 34.

In use, a subject grips the mouthpiece 26 in his or her lips and fitsthe nosepiece 30 into one of his or her nostrils. The subject thenexhales through the mouthpiece 26, the flow of which exhaled air isresisted by the flow resistor 28 in the tubular section 24 such as todevelop a positive pressure in the oral cavity of the subject, with thepositive pressure being such as to develop a pressure differentialacross the velum sufficient to cause closure of the velum of thesubject. The applicant has established that a positive pressuredifferential between the oral cavity and the nasal airway of about 5 cmH₂O is required to maintain the velum in the closed position. Theapplicant has further established that a subject should be able tomaintain a flow rate of about 3 to 30 litres per minute for about 1 to20 seconds, with flow rates of about 10 to 20 litres per minute anddelivery times of about 2 to 5 seconds being considered as optimal.After closure of the velum, the medicament supply unit 32 is thenactuated to deliver a gas flow entraining medicament through thenosepiece 30 and into the nasal airway of the subject. As mentionedabove, this gas flow is at such a pressure as to open a communicationpath beyond the posterior margin of the nasal septum such that the gasflow flows through the one nasal cavity, around the posterior margin ofthe nasal septum, in effect being re-directed through an angle of 180degrees, and out of the other nasal cavity. Again, as already described,this bi-directional flow provides for a much enhanced deposition of themedicament in the posterior region of the nasal airway.

In one modification, the medicament supply unit 32 can be omitted fromthe delivery unit 22, and instead a metered dose of dry powder loadedinto a compartment in the tubular section 34, with the delivery air flowbeing provided by another person, such as the parent of a paediatricsubject, blowing into the distal end of the tubular section 34.

FIG. 5 illustrates a delivery device in accordance with a secondembodiment of the present invention.

The delivery device comprises the oral exhalation unit 20 and thedelivery unit 22 of the above-described first embodiment, and an outletunit 36 for fitting to the other nostril of a subject to which thedelivery unit 22 is fitted.

The outlet unit 36 comprises a tubular section 38 and a nosepiece 40, inthis embodiment formed of a resilient material such as a polymericmaterial, attached to one end of the tubular section 38 for providing atight sealing fit in the other nostril of the subject. The nosepiece 40is formed separately of the tubular section 38 to allow for replacement,but could alternatively be integrally formed. In this embodiment thenosepiece 40 is a snap fit on the tubular section 38, but could equallybe a screw fit. As with the nosepiece 30 of the delivery unit 22, in apreferred embodiment the nosepiece 40 can include an external olive orbe shaped to cause the anterior region of the other nasal cavity intowhich the nosepiece 40 is inserted to be enlarged. The tubular section38 includes a flow resistor 41, in this embodiment a baffle plate,configured to provide a sufficient flow resistance to an exhalation flowtherethrough as to cause the generation of a dynamic positive pressurein the nasal airway. In a preferred embodiment the flow resistor 41 isadjustable to allow for adjustment of the level of the resistance andhence provide control of the dynamic pressure in the nasal airway. Inalternative embodiments the flow resistor 41 could be a movable member,such as a biased flap, a resilient membrane or a damped wheel.

In a preferred embodiment the outlet unit 36 includes an indicator forproviding at least one of a visual or audible signal on achieving apredetermined positive pressure upstream thereof, that is, in the nasalairway. Preferably, the indicator comprises a whistle. In this way, thesubject is provided with positive feedback of proper use of the device.

Use of the delivery device of this embodiment is the same as for theabove-described first embodiment. However, as mentioned above, by theprovision of the flow resistor 41 in the outlet unit 36 downstream ofthe outlet nostril of the subject, a positive dynamic pressure ismaintained in the nasal airway. This positive pressure advantageouslyacts to dilate the various ostia in the nasal airway, such as the sinusostia and the tubal ostia, and the associated tubes, namely the sinustubes and the auditory tubes, so as to promote the delivery ofmedicament thereto. Further, this positive pressure acts to improvedeposition on the adenoid which can often obstruct the tubal ostia, themiddle meatus which is a common location of nasal polyps, and the cleftto the olfactory cells.

FIG. 6 illustrates a delivery device in accordance with a thirdembodiment of the present invention.

The delivery device is very similar to that of the delivery device ofthe above-described second embodiment, and thus, in order to avoidunnecessary duplication of description, only the differences will bedescribed in detail, with like parts being designated by like referencesigns. This delivery device differs only in further comprising apressure sensor 43, in this embodiment a pressure-sensitive spring ormembrane, located in the tubular section 34 of the delivery unit 22downstream of the medicament supply unit 32, and a control unit 44coupled to the sensor 43 and the medicament supply unit 32.

The control unit 44 is configured to control the flow rate of thedelivery gas supplied by the medicament supply unit 32 in order tooptimise the particle deposition efficiency in the nasal airwayregardless of the degree of nasal congestion. As mentioned hereinabove,by maintaining an optimum flow rate in the nasal airway, the depositionefficiency of the medicament-containing particles is increased, referredto as the particle deposition efficiency. If, ordinarily, a flow rate ofabout 15 litres per minute is required to maximise the particledeposition efficiency, then in a congested nasal airway a lower flowrate, possibly 10 litres per minute, would be required and in an opennasal airway a higher flow rate, possibly 20 litres per minute, would berequired.

Operation of this delivery device is otherwise the same as that of theabove-described second embodiment.

FIG. 7 illustrates a modified oral exhalation unit 20 for the deliverydevices of the above-described embodiments.

This modified oral exhalation unit 20 differs in that the tubularsection 24 includes a lateral opening 45 upstream of the flow resistor28 and in further comprising, as an indicator, an inflatable FIG. 46connected to the lateral opening 45, which FIG. 46 when inflated assumesa prominent position in the field of vision of the subject. In FIG. 6,the FIG. 46 is shown inflated. By providing such a display feature,subject compliance, particularly in paediatric subjects, should beimproved. The oral exhalation unit 20 further comprises an inflationline 48 connected to the FIG. 46 which allows the FIG. 46 to be furtherinflated by another person, typically the parent of a paediatricsubject, or a pump. In an alternative embodiment, instead of beinginflatable, the FIG. 46 could be of any kind which is brought into aprominent position on exhalation by the subject, typically amechanically or electrically-operated figure. In a preferred embodimentthe FIG. 46 can be configured so as to be inflated on the subjectachieving an optimum exhalation flow rate. In this way, the FIG. 46 actsas an indicator.

Use of the delivery device of this embodiment is the same as that of theabove-described first embodiment. However, on exhaling through themouthpiece 26, the developed pressure causes the FIG. 46 to be inflatedand assume a prominent position in the field of vision of the subject.This appearance of the FIG. 46 is particularly appealing for paediatricsubjects as the fun element of inflating the FIG. 46 can alleviate anyunnecessary anxiety.

FIG. 8 illustrates a delivery device in accordance with a fourthembodiment of the present invention.

The delivery device comprises a chamber 50 which includes an inlet 52and an outlet 54, a mouthpiece 56 connected to the inlet 52 and anosepiece 58 connected to the outlet 54. The nosepiece 58 is configuredto provide a tight sealing fit in one of the nostrils of a subject. Thechamber 50 includes a flow resistor 60, in this embodiment a pluralityof baffle plates, and a medicament-receiving compartment 62 downstreamof the flow resistor 60 for containing a metered dose of a dry powdercontaining medicament to be delivered to the nasal airway of a subject.In this embodiment the nosepiece 58 is formed of a resilient materialsuch as a polymeric material. In a preferred embodiment the chamber 50may include a desiccant. In a preferred embodiment the flow resistor 60can be provided by a moisture-absorbing filter.

In use, a subject grips the mouthpiece 56 in his or her lips and fitsthe nosepiece 58 into one of his or her nostrils. The subject thenexhales through the mouthpiece 56, the flow of which exhaled air isresisted by the flow resistor 60 in the chamber 50 and the resistance ofthe nasal airway such as to develop a positive pressure in the oralcavity of the subject sufficient to cause closure of the velum. Theexhaled air, after passing the flow resistor 60, then entrains thepowdered medicament in the medicament-receiving compartment 62, and thisair flow entraining medicament then passes through the nosepiece 58 intothe nasal airway of the subject. The exhaled air entering the nasalairway is at a pressure sufficient to open a communication path beyondthe posterior margin of the nasal septum such that the air flow flowsthrough the one nasal cavity, around the posterior margin of the nasalseptum, in effect being re-directed through an angle of 180 degrees, andout of the other nasal cavity. Again, as already described, thisbi-directional flow provides for a much enhanced deposition of themedicament in the posterior margin of the nasal airway.

In a preferred embodiment the delivery device includes apressure-triggered valve, preferably located in the mouthpiece 56, whichis configured to open only when a predetermined positive pressure hasbeen developed by the exhalation of the subject, typically at a positivepressure of about 10 cm H₂O. This configuration advantageously avoidsthe possibility of medicament being delivered to the nasal airway withthe velum in the open position and thereby reduces the risk ofundesirably depositing medicament outside the nasal airway.

In another preferred embodiment, similarly to third-describedembodiment, the delivery device can include an outlet unit for providinga flow resistor downstream of the other nostril of the subject such asto maintain a positive dynamic pressure in the nasal airway.

FIG. 9 illustrates a delivery device in accordance with a fifthembodiment of the present invention.

The delivery device comprises an oral exhalation unit 70 through which asubject exhales to close his or her velum and a medicament delivery unit72 for supplying an air flow entraining medicament to the nasal airwayof the subject.

The oral exhalation unit 70 comprises a tubular section 74 and amouthpiece 76 attached to one end of the tubular section 74. Themouthpiece 76, which is gripped in the lips of the subject, is formedseparately of the tubular section 74 to allow for replacement, but couldalternatively be integrally formed therewith. In this embodiment themouthpiece 76 is a snap fit on the tubular section 74, but could equallybe a screw fit. The tubular section 74 includes a flow resistor 78, inthis embodiment a gearwheel, configured to rotate on exhalation by thesubject and yet provide sufficient resistance to the exhalation flow asto cause the generation of a positive pressure in the oral cavity of thesubject sufficient to maintain the required positive pressuredifferential between the oral cavity and the nasal airway and therebymaintain the velum in the closed position.

The delivery unit 72 comprises a tubular section 80 and a nosepiece 82,in this embodiment formed of a resilient material such as a polymericmaterial, for providing a tight sealing fit in one of the nostrils ofthe subject, attached to one end of the tubular section 80. Thenosepiece 82 is formed separately of the tubular section 80 to allow forreplacement, but could alternatively be integrally formed therewith. Inthis embodiment the nosepiece 82 is a snap fit on the tubular section80, but could equally be a screw fit. In a preferred embodiment thenosepiece 82 can include an external olive or be shaped to cause theanterior region of the nasal cavity, into which the nosepiece 82 isinserted, to be enlarged. In a particularly preferred embodiment thenosepiece 82 can be shaped, for example by including swirl-inducingprojections, to provide the exiting air flow with an optimal flowpattern and particle size distribution. The tubular section 80 includesan impeller 84 coupled to the gearwheel 78 in the tubular section 74 ofthe oral exhalation unit 70, such as to be rotated on rotation of thegearwheel 78 to draw air into the tubular section 80 and provide an airflow therethrough at a pressure sufficient to open the flow path beyondthe posterior margin of the nasal septum when delivered into one of thenasal cavities of the subject.

The delivery unit 72 further comprises a dispensing unit 86 fordispensing a metered dose of a dry powder containing medicament to thetubular section 80 upstream of the impeller 84. In this embodiment thedispensing unit 86 is manually actuated to supply a metered dose of drypowder containing medicament into the tubular section 80, but couldalternatively be configured to the driven by the gearwheel 78 so as toavoid the need for any manual intervention on the part of the subject.

In use, a subject grips the mouthpiece 76 in his or her lips and fitsthe nosepiece 82 into one of his or her nostrils. The subject thenexhales through the mouthpiece 76, the flow of which exhaled air isresisted by the gearwheel 78 such as to develop a positive pressure inthe oral cavity of the subject sufficient to cause the velum of thesubject to close. The exhaled air causes rotation of the gearwheel 78which in turn causes rotation of the impeller 84, and the rotation ofthe impeller 84 develops an air flow through the tubular section 80which entrains the metered dose of dry powder containing medicament anddelivers the same through the nosepiece 82 to the nasal airway of thesubject. As mentioned above, this air flow is at a pressure sufficientto open a communication path beyond the posterior margin of the nasalseptum such that the air flow flows through the one nasal cavity, aroundthe posterior margin of the nasal septum, in effect being re-directedthrough an angle of 180 degrees, and out of the other nasal cavity.Again, as already described, this bi-directional flow provides for amuch enhanced deposition of the medicament in the posterior region ofthe nasal cavity.

In a preferred embodiment the gearwheel 78 is configured such thatrotation thereof is prevented until a predetermined flow rate has beendeveloped which is sufficient to ensure that the entraining gas flowdeveloped by the impeller 84 is optimal. This configurationadvantageously ensures an optimal particle deposition efficiency andavoids the possibility of medicament being delivered to the nasal airwaywith the velum in the open position so as to reduce the risk ofundesirably depositing medicament outside the nasal airway.

FIG. 10 illustrates a delivery device in accordance with a sixthembodiment of the present invention.

The delivery device comprises a housing 90 for housing a blister packelement 92 which includes a plurality of blisters 94 therein, eachcontaining powder containing medicament, and a tubular section 96 incommunication with one of the blisters 94 when open, one end of whichtubular section 96 provides a mouthpiece 98 which in use is gripped inthe lips of a subject. The tubular section 96 includes an element 100movably disposed therein between a first, normally closed position and asecond, open position. In this embodiment the element 100 comprises apropeller or the like rotatably mounted on a threaded shaft and normallybiased to the closed position by a compression spring. The element 100is configured both to function as a flow resistor and a valve. In thisembodiment the element 100 is configured to move to themedicament-releasing open position by rotation along the threaded shaftagainst the bias of the compression spring, with the powder beingentrainable by an air flow only when the exhalation flow exceeds apredetermined flow rate. The flow rate, preferably in the range of about5 to 20 litres per minute, at which the powder containing medicament isentrained by the air flow is a function, in inverse relation, to thedriving pressure which is itself a function of the nasal resistance asdescribed hereinabove. As will be understood, this configurationadvantageously provides for an optimal particle deposition efficiency inreleasing the powder containing medicament at the optimal flow rate, andavoids the possibility of medicament being delivered to the nasal airwaywith the velum in the open position.

The delivery device further comprises a nosepiece 102, in thisembodiment formed of a resilient material such as a polymeric material,for providing a tight sealing fit in one of the nostrils of the subjectattached to the other end of the tubular section 96 downstream of theelement 100. The nosepiece 102 is formed separately of the tubularsection 96 to allow for replacement, but could alternatively beintegrally formed therewith. In this embodiment the nosepiece 102 is asnap fit on the tubular section 96, but could equally be a screw fit. Ina preferred embodiment the nosepiece 102 can include an external oliveor be shaped to cause the anterior region of the nasal cavity into whichthe nosepiece 102 is inserted to be enlarged. In a particularlypreferred embodiment the nosepiece 102 can be shaped, for example byincluding swirl-inducing projections, to provide the exiting air flowwith an optimal flow pattern and particle size distribution.

The delivery device further comprises a blister opening mechanism 104for opening the blister 94 in communication with the tubular section 96.In this embodiment the blister opening mechanism 104 is manuallyoperated by the subject prior to delivery.

In use, a subject grips the mouthpiece 98 in his or her lips and fitsthe nosepiece 102 into one of his or her nostrils. The subject thenexhales through the mouthpiece 98, the flow of which exhaled air isresisted by the element 100 until a predetermined flow rate has beenachieved. Once this predetermined flow rate has been achieved, at whichflow rate the velum is in the closed position, the element 100 is in theopen position and the exhaled air flow entrains the powdered medicamentin the blister 94 and delivers the same through the nosepiece 102 to thenasal airway. The driving pressure of this air flow is at a levelsufficient to maintain a communication path beyond the posterior marginof the nasal septum such that the air flow flows through the one nasalcavity, around the posterior margin of the nasal septum, in effect beingre-directed through an angle of 180 degrees, and out of the other nasalcavity. Again, as already described, this bi-directional flow providesfor a much enhanced deposition of the medicament in the posterior marginof the nasal cavity.

In a preferred embodiment the delivery device includes a blister packadvancement mechanism, operated by movement of the mouthpiece 98, forrotating the blister pack element 92 such that another unused blister 94is located at the delivery position. In a particularly preferredembodiment the blister pack advancement mechanism can be coupled to theblister opening mechanism 104 such as automatically to open the blister94, and thereby avoid the need for any further intervention by thesubject.

In one modification, similarly to the above-described modification ofthe first embodiment as illustrated in FIG. 5, the delivery device caninclude an outlet unit for providing a flow resistor downstream of theother nostril of the subject such as to maintain a positive dynamicpressure in the nasal airway.

In another modification, the blister pack element 92 can be omitted andthe housing 90 instead provided with a chamber which is in communicationwith the tubular section 96 and into which a metered dose of dry powdercontaining medicament can be loaded. With this configuration, the powderin the chamber is entrained on the element 100 being driven to thesecond position and the blister pack advancement mechanism is configuredto meter a dose of powder containing medicament into the chamber onoperation thereof.

As will be understood, in essence, the present invention can be broadlybased on any dry powder inhaler, such as the Turbuhaler™ as manufacturedby AstraZeneca PLC, the Accuhaler™ as manufactured by Glaxo PLC or theTwisthaler™ as manufactured by Schering AG, where the usual mouthpieceis replaced by a nosepiece and a mouthpiece is provided in communicationwith the air inlet of the inhaler such as to utilise the air exhaled bya subject as the entraining delivery air.

FIG. 11 illustrates a delivery device in accordance with a seventhembodiment of the present invention.

The delivery device comprises a housing 110 and a tubular section 112extending through the housing 110, one end of which provides amouthpiece 114 which in use is gripped in the lips of a subject.

The tubular section 112 includes an element 116 movably disposed thereinbetween a first, normally closed position and a second, triggerposition. In this embodiment the element 116 comprises a propeller orthe like rotatably mounted on a threaded shaft and normally biased tothe closed position by a compression spring. The element 116 isconfigured to function as a flow resistor, a valve and a trigger for thedelivery of an aerosol spray into the tubular section 112 as will bedescribed in detail hereinbelow. In this embodiment the element 116 isconfigured to move to the medicament-releasing open position, byrotation along the threaded shaft against the bias of the compressionspring, only when the exhalation flow exceeds a predetermined flow rate.The flow rate at which the medicament is released, preferably in therange of about 5 to 20 litres per minute, is a function, in inverserelation, to the driving pressure which is itself a function of thenasal resistance as described hereinabove. As will be understood, thisconfiguration advantageously provides for an optimal particle depositionefficiency in releasing the medicament at the optimal flow rate, andavoids the possibility of medicament being delivered to the nasal airwaywith the velum in the open position.

The tubular section 112 further includes a nozzle block 117 forproviding an aerosol spray through the tubular section 112 along thelongitudinal axis thereof. As will be described in detail hereinbelow,the nozzle block 117 receives the valve stem 122 of an aerosol canister120.

The delivery device further comprises a known aerosol canister 120 usedto deliver metered volumes of a propellant, preferably ahydrofluoroalkane (HFA) propellant or the like, containing medicament,either as a suspension or as a solution. The aerosol canister 120comprises a main body 121 which contains a volume of propellant underpressure containing medicament, a valve stem 122 through which thepropellant containing medicament is in use delivered on relativemovement of the main body 121 and the valve stem 122, and a meteringvalve 124 for metering a predetermined volume of propellant containingmedicament to the valve stem 122 on movement thereof.

The delivery device further comprises a trigger mechanism 126 forrelatively moving the main body 121 and the valve stem 122 of theaerosol canister 120 to effect the delivery of a metered volume ofpropellant containing medicament through the nozzle block 117. In thisembodiment the trigger mechanism 126 comprises a resilient element 128for loading the main body 121 with an actuation force, and a leverassembly 130 coupled to the movable element 116 to cause the release ofthe actuation force provided by the resilient element 128 on movement ofthe movable element 116 from the closed position to the triggerposition.

The delivery device further comprises a nosepiece 132, in thisembodiment formed of a resilient material such as a polymeric material,for providing a tight sealing fit in one of the nostrils of the subject,attached to the other end of the tubular section 112 downstream of themovable element 116. The nosepiece 132 is formed separately of thetubular section 112 to allow for replacement, but could alternatively beintegrally formed therewith. In this embodiment the nosepiece 132 is asnap fit on the tubular section 112, but could equally be a screw fit.In a preferred embodiment the nosepiece 132 can include an externalolive or be shaped to cause the anterior region of the nasal cavity intowhich the nosepiece 132 is inserted to be enlarged. In a particularlypreferred embodiment the nosepiece 132 can be shaped, for example byincluding swirl-inducing projections, to provide the exiting air flowwith an optimal flow pattern and particle size distribution.

In use, a subject primes the trigger mechanism 126, grips the mouthpiece114 in his or her lips and fits the nosepiece 132 into one of his or hernostrils. The subject then exhales through the mouthpiece 114, the flowof which exhaled air is resisted by the movable element 116 until apredetermined flow rate has been achieved. Once this predetermined flowrate has been achieved, at which flow rate the velum is in the closedposition, the movable element 116 is in the open position, triggeringthe movement of the lever assembly 130 and hence the relative movementof the main body 121 and the valve stem 122 of the canister 120 todeliver a metered volume of propellant containing medicament to thenozzle block 117 to generate an aerosol spray of liquid dropletscontaining medicament through the nosepiece 132 to the nasal airway.This aerosol flow is at a pressure sufficient to maintain acommunication path beyond the posterior margin of the nasal septum suchthat the flow flows through the one nasal cavity, around the posteriormargin of the nasal septum, in effect being re-directed through an angleof 180 degrees, and out of the other nasal cavity. Again, as alreadydescribed, this bi-directional flow provides for a much enhanceddeposition of the medicament in the posterior margin of the nasalcavity.

As will be understood, in essence, the present invention can be broadlybased on any breath-actuated pressurised metered dose inhaler, where theusual mouthpiece is replaced by a nosepiece and a mouthpiece is providedin communication with the air inlet of the inhaler such as both totrigger the triggering mechanism and utilise the air exhaled by asubject as the entraining delivery air.

Finally, it will be understood that the present invention has beendescribed in its preferred embodiments and can be modified in manydifferent ways without departing from the scope of the invention asdefined by the appended claims.

The present invention relates to a nasal delivery device for and amethod of delivering a substance, in particular one of a liquid, as asuspension or solution, or a powder containing a medicament, especiallysystemic or topical pharmaceuticals, or a vaccine to the nasal airway ofa subject.

Referring to FIG. 12, the nasal airway 1 comprises the two nasalcavities separated by the nasal septum, which airway 1 includes numerousostia, such as the paranasal sinus ostia 3 and the tubal ostia 5, andolfactory cells, and is lined by the nasal mucosa. The nasal airway 1can communicate with the nasopharynx 7, the oral cavity 9 and the lowerairway 11, with the nasal airway 1 being in selective communication withthe anterior region of the nasopharynx 7 and the oral cavity 9 byopening and closing of the oropharyngeal velum 13. The velum 13, whichis often referred to as the soft palate, is illustrated in solid line inthe closed position, as achieved by providing a certain positivepressure in the oral cavity 9, such as achieved on exhalation throughthe oral cavity 9, and in dashed line in the open position.

There are many nasal conditions which require treatment. One suchcondition is nasal inflammation, specifically rhinitis, which can beallergic or non-allergic and is often associated with infection andprevents normal nasal function. By way of example, allergic andnon-allergic inflammation of the nasal airway can typically effectbetween 10 and 20% of the population, with nasal congestion of theerectile tissues of the nasal concha, lacrimation, secretion of waterymucus, sneezing and itching being the most common symptoms. As will beunderstood, nasal congestion impedes nasal breathing and promotes oralbreathing, leading to snoring and sleep disturbance. Other nasalconditions include nasal polyps which arise from the paranasal sinuses,hypertrophic adenoids, secretory otitis media, sinus disease and reducedolfaction.

In the treatment of certain nasal conditions, the topical administrationof medicaments is preferable, particularly where the nasal mucosa is theprime pathological pathway, such as in treating or relieving nasalcongestion. Medicaments that are commonly topically delivered includedecongestants, anti-histamines, cromoglycates, steroids and antibiotics.At present, among the known anti-inflammatory pharmaceuticals, topicalsteroids have been shown to have an effect on nasal congestion. Topicaldecongestants have also been suggested for use in relieving nasalcongestion. The treatment of hypertrophic adenoids and chronic secretoryotitis media using topical decongestants, steroids and anti-microbialagents, although somewhat controversial, has also been proposed.Further, the topical administration of pharmaceuticals has been used totreat or at least relieve symptoms of inflammation in the anteriorregion of the nasopharynx, the paranasal sinuses and the auditory tubes.

Medicaments can also be systemically delivered through the nasalpathway, the nasal pathway offering a good administration route for thesystemic delivery of pharmaceuticals, such as hormones, for example,oxytocin and calcitionin, and analgetics, such as anti-migrainecompositions, as the high blood flow and large surface area of the nasalmucosa advantageously provides for rapid systemic uptake.

Nasal delivery is also expected to be advantageous for theadministration of medicaments requiring a rapid onset of action, forexample, analgetics, anti-emetics, insulin, anti-epileptics, sedativesand hypnotica, and also other pharmaceuticals, for example,cardio-vascular drugs. It is envisaged that nasal administration willprovide for a fast onset of action, at a rate similar to that ofinjection and at a rate much faster than that of oral administration.Indeed, for the treatment of many acute conditions, nasal administrationis advantageous over oral administration, since gastric stasis canfurther slow the onset of action following oral administration.

It is also expected that nasal delivery could provide an effectivedelivery route for the administration of proteins and peptides asproduced by modem biotechnological techniques. For such substances, themetabolism in the intestines and the first-pass-effect in the liverrepresent significant obstacles for reliable and cost-efficientdelivery.

Furthermore, it is expected that nasal delivery using the nasal deliverytechnique of the present invention will prove effective in the treatmentof many common neurological diseases, such as Alzheimer's, Parkinson's,psychiatric diseases and intracerebral infections, where not possibleusing existing techniques. The nasal delivery technique of the presentinvention allows for delivery to the olfactory region, which region islocated in the superior region of the nasal cavities and represents theonly region where it is possible to circumvent the blood-to-brainbarrier (BBB) and enable communication with the cerebrospinal fluid(CSF) and the brain.

Also, it is expected that the nasal delivery technique of the presentinvention will allow for the effective delivery of vaccines.

Aside from the delivery of medicaments, the irrigation of the nasalmucosa with liquids, in particular saline solutions, is commonlypractised to remove particles and secretions, as well as to improve themucociliary activity of the nasal mucosa. These solutions can be used incombination with active pharmaceuticals.

For any kind of drug delivery, accurate and reliable dosing isessential, but it is of particular importance in relation to theadministration of potent drugs which have a narrow therapeutic window,drugs with potentially serious adverse effects and drugs for thetreatment of serious and life-threatening conditions. For someconditions, it is essential to individualize the dosage to theparticular situation, for example, in the case of diabetes mellitus. Fordiabetes, and, indeed, for many other conditions, the dosage of thepharmaceutical is preferably based on actual real-time measurements.Currently, blood samples are most frequently used, but the analysis ofmolecules in the exhalation breath of subjects has been proposed as analternative to blood analysis for several conditions. Breath analysis iscurrently used for the diagnosis of conditions such as Helicobacterpylori infections which cause gastric ulcers.

WO-A-00/51672 discloses a delivery device for delivering a substance, inparticular a medicament, in a bi-directional flow through the nasalcavities, that is, an air flow which passes into one nostril, around theposterior margin of the nasal septum and in the opposite direction outof the other nostril. This bi-directional air flow advantageously actsto stimulate the sensory nerves in the nasal mucosa, therebyconditioning the subject for the delivery and providing a morecomfortable delivery situation.

It is an aim of the present invention to provide improved nasal deliverydevices and nasal delivery methods for providing for the improveddelivery of a substance to a nasal cavity of subject.

In one aspect the present invention provides a nasal delivery device fordelivering substance to a nasal airway of a subject, comprising: anosepiece for fitting to a nostril of a subject, the nosepiece includinga nozzle through which substance is in use delivered to the nasalairway, and at least one inflatable cuff member which is configured tobe inflated subsequent to exhalation by the subject; and a delivery unitfor delivering substance through the nozzle of the nosepiece.

In another aspect the present invention provides a nasal delivery devicefor delivering substance to a nasal cavity of a subject, comprising: anosepiece including a nozzle through which substance is in use deliveredto the nasal cavity, and at least one inflatable cuff member which isconfigured such as, when inflated, to provide a fluid-tight seal betweenthe nosepiece and an inner wall of the nasal cavity of the subject; anda delivery unit for delivering substance through the nozzle of thenosepiece.

In a further aspect the present invention provides a nasal deliverydevice for delivering substance to a nasal airway of a subject,comprising: a nosepiece for fitting to a nostril of a subject, thenosepiece including a nozzle through which substance is in use deliveredto the nasal airway, and at least one cuff member which is configuredsuch as, when fitted in a nasal cavity of the subject, to engage aninner wall of the nasal cavity of the subject and direct at least adistal end of the nozzle towards a site in the nasal airway of thesubject; and a delivery unit for delivering substance through the nozzleof the nosepiece.

In yet another aspect the present invention provides a nasal deliverydevice for delivering substance to a nasal airway of a subject,comprising: a nosepiece for fitting to a nostril of a subject, thenosepiece including a nozzle through which substance is in use deliveredto the nasal airway, and at least one cuff member, at least one of theat least one cuff member including at least one lobe which, when the atleast one of the at least one cuff member is fitted in the nasal cavityof the subject, extends into a region of the nasal cavity of the subjectsuch as to at least partially obstruct the same and prevent flowthereinto; and a delivery unit for delivering substance through thenozzle of the nosepiece.

In a yet further aspect the present invention provides a nasal deliverydevice for delivering substance to a nasal airway of a subject,comprising: a nosepiece for fitting to a nasal cavity of a subject, thenosepiece including a first delivery outlet through which substance isin use delivered to the nasal airway of the subject, and at least onesecond delivery outlet through which at least one gas flow, separate toan exhalation breath of the subject, is in use delivered to the nasalairway of the subject; a delivery unit for delivering substance throughthe first delivery outlet of the nosepiece; and a gas supply unit forsupplying a flow of gas through the at least one second delivery outletof the nosepiece.

In yet another further aspect the present invention provides a method ofdelivering substance to a nasal airway of a subject, comprising: fittinga nosepiece to a nasal cavity of a subject, the nosepiece including anozzle through which substance is delivered to the nasal airway, and atleast one inflatable cuff member; inflating the at least one cuff membersubsequent to exhalation by the subject; and delivering substancethrough the nozzle of the nosepiece.

In a still further aspect the present invention provides a method ofdelivering substance to a nasal cavity of a subject, comprising thesteps of: fitting a nosepiece to a nasal cavity of a subject, thenosepiece including a nozzle through which substance is delivered to thenasal cavity, and at least one inflatable cuff member which isconfigured such as, when inflated, to provide a fluid-tight seal betweenthe nosepiece and an inner wall of the nasal cavity of the subject; anddelivering substance through the nozzle of the nosepiece.

In still yet another further aspect the present invention provides amethod of delivering substance to a nasal airway of a subject,comprising the steps of: fitting a nosepiece to a nasal cavity of asubject, the nosepiece including a nozzle through which substance isdelivered to the nasal airway, and at least one cuff member which isconfigured such as, when fitted in the nasal cavity of the subject, toengage an inner wall of the nasal cavity of the subject and direct atleast a distal end of the nozzle towards a site in the nasal airway ofthe subject; and delivering substance through the nozzle of thenosepiece.

In a still yet further aspect the present invention provides a method ofdelivering substance to a nasal airway of a subject, comprising thesteps of: fitting a nosepiece to a nasal cavity of a subject, thenosepiece including a nozzle through which substance is delivered to thenasal airway, and at least one cuff member, at least one of the at leastone cuff member including at least one lobe which, when the at least oneof the at least one cuff member is fitted in the nasal cavity of thesubject, extends into a region of the nasal cavity of the subject suchas to at least partially obstruct the same and prevent flow thereinto;and delivering substance through the nozzle of the nosepiece.

In a still yet another further aspect the present invention provides amethod of delivering substance to a nasal airway of a subject,comprising the step of: delivering substance through a first deliveryoutlet and at least one gas flow, separate to an exhalation breath of asubject, through at least one second delivery outlet into the nasalairway of the subject.

Preferred embodiments of the present invention will now be describedhereinbelow by way of example only with reference to the accompanyingdrawings, in which:

FIG. 12 schematically illustrates the anatomy of the upper respiratorytract of a human subject;

FIG. 13 schematically illustrates a nasal delivery device in accordancewith a first embodiment of the present invention;

FIG. 14 schematically illustrates the delivery device of FIG. 13inserted in a nasal cavity of a subject for operation;

FIG. 15 schematically illustrates the delivery device of FIG. 13 duringactuation;

FIG. 16 schematically illustrates the delivery device of FIG. 13following actuation;

FIG. 17 schematically illustrates a nasal delivery device in accordancewith a second embodiment of the present invention;

FIG. 18 schematically illustrates the delivery device of FIG. 17inserted in a nasal cavity of a subject for operation;

FIG. 19 schematically illustrates the delivery device of FIG. 17 duringactuation;

FIG. 20 schematically illustrates the delivery device of FIG. 17following actuation;

FIG. 21 schematically illustrates a nasal delivery device in accordancewith a third embodiment of the present invention;

FIG. 22 schematically illustrates the delivery device of FIG. 21inserted in a nasal cavity of a subject for operation;

FIG. 23 schematically illustrates the delivery device of FIG. 21 duringactuation;

FIG. 24 schematically illustrates the delivery device of FIG. 21following actuation;

FIG. 25 schematically illustrates a nasal delivery device in accordancewith a fourth embodiment of the present invention;

FIG. 26 schematically illustrates the delivery device of FIG. 25inserted in a nasal cavity of a subject for operation;

FIG. 27 schematically illustrates the delivery device of FIG. 25 duringactuation;

FIG. 28 schematically illustrates a nasal delivery device in accordancewith a fifth embodiment of the present invention;

FIG. 29 schematically illustrates the delivery device of FIG. 28inserted in a nasal cavity of a subject for operation;

FIG. 30 schematically illustrates the delivery device of FIG. 28 duringactuation;

FIG. 31 schematically illustrates a nasal delivery device in accordancewith a sixth embodiment of the present invention;

FIG. 32 schematically illustrates the delivery device of FIG. 31inserted in a nasal cavity of a subject for operation;

FIG. 33 schematically illustrates the delivery device of FIG. 31 duringactuation;

FIG. 34 schematically illustrates a nasal delivery device in accordancewith a seventh embodiment of the present invention;

FIG. 35 schematically illustrates the delivery device of FIG. 34inserted in a nasal cavity of a subject for operation;

FIG. 36 schematically illustrates the delivery device of FIG. 34 duringactuation;

FIG. 37 schematically illustrates the delivery device of FIG. 34following actuation;

FIG. 38 schematically illustrates a nasal delivery device in accordancewith an eighth embodiment of the present invention;

FIG. 39 schematically illustrates the delivery device of FIG. 38inserted in a nasal cavity of a subject for operation;

FIG. 40 schematically illustrates the delivery device of FIG. 38 duringactuation;

FIG. 41 schematically illustrates the delivery device of FIG. 38following actuation;

FIG. 42 schematically illustrates a nasal delivery device in accordancewith a ninth embodiment of the present invention;

FIG. 43 schematically illustrates the delivery device of FIG. 42inserted in a nasal cavity of a subject for operation;

FIG. 44 schematically illustrates the delivery device of FIG. 42 duringactuation;

FIG. 45 schematically illustrates the delivery device of FIG. 42following actuation;

FIG. 46 schematically illustrates a nasal delivery device in accordancewith a tenth embodiment of the present invention, illustrated in theinoperative configuration;

FIG. 47 schematically illustrates the delivery device of FIG. 46 wherethe driving unit is primed for actuation;

FIG. 48 schematically illustrates the delivery device of FIG. 46inserted in a nasal cavity of a subject for operation;

FIG. 49 schematically illustrates the delivery device of FIG. 46 duringactuation where the subject has commenced exhaling and the deliverydevice is at the point of actuation;

FIG. 50 schematically illustrates the delivery device of FIG. 46 duringactuation;

FIG. 51 schematically illustrates a nasal delivery device in accordancewith an eleventh embodiment of the present invention, illustrated in theinoperative configuration;

FIG. 52 schematically illustrates the delivery device of FIG. 51 wherethe driving unit is primed for actuation;

FIG. 53 schematically illustrates the delivery device of FIG. 51inserted in a nasal cavity of a subject for operation;

FIG. 54 schematically illustrates the delivery device of FIG. 51 wherethe subject has commenced exhaling and the delivery device is at thepoint of actuation;

FIG. 55 schematically illustrates the delivery device of FIG. 51 wherethe driving unit has been actuated, the driving unit having initiatedactuation of the gas delivery unit and being at the point of initiatingactuation of the substance supply unit;

FIG. 56 schematically illustrates the delivery device of FIG. 51 duringfull actuation;

FIG. 57 schematically illustrates a nasal delivery device in accordancewith a twelfth embodiment of the present invention, illustrated in theinoperative configuration;

FIG. 58 schematically illustrates the delivery device of FIG. 57 wherethe driving unit is primed for actuation;

FIG. 59 schematically illustrates the delivery device of FIG. 57inserted in a nasal cavity of a subject for operation;

FIG. 60 schematically illustrates the delivery device of FIG. 57 wherethe subject has commenced exhaling and the delivery device is at thepoint of actuation;

FIG. 61 schematically illustrates the delivery device of FIG. 57 wherethe driving unit has been actuated, the driving unit having initiatedactuation of the gas delivery unit and being at the point of initiatingactuation of the substance supply unit; and FIG. 62 schematicallyillustrates the delivery device of FIG. 57 during full actuation.

FIGS. 13 to 16 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a first embodiment of the present invention.

The delivery device comprises a housing 15, a nosepiece 17 for fittingin a nasal cavity of a subject, and a mouthpiece 19 through which thesubject exhales to actuate the delivery device.

The nosepiece 17 comprises a guide member 20, in this embodiment afrusto-conical element, for guiding the nosepiece 17 into a nasal cavityof the subject, and an outlet unit 21 for delivering substance into thenasal airway of the subject. In this embodiment the nosepiece 17 is areplaceable unit.

In this embodiment the outlet unit 21 comprises a delivery channel 23which is in fluid communication with the mouthpiece 19 such that an airflow is delivered into and through the nasal airway of the subject onexhalation by the subject through the mouthpiece 19, and a nozzle 25 fordelivering substance to the nasal airway of the subject. In thisembodiment the nozzle 25 is disposed in the delivery channel 23co-axially with the same. In this embodiment the nozzle 25 is configuredto provide an aerosol spray. In an alternative embodiment, for thedelivery of a liquid, the nozzle 25 could be configured to deliver aliquid jet as a column of liquid.

In this embodiment the outlet unit 21 is movably coupled to the housing15, here as provided by a flexible coupling, such as to allow for thepositioning of the outlet unit 21 in the nasal cavity of the subject, aswill be described in more detail hereinbelow.

In an alternative embodiment the outlet unit 21 could be fixed to thehousing 15, and the mouthpiece 19 instead movably coupled to the housing15, here as provided by a flexible coupling, such as to allow for thepositioning of the outlet unit 21 in the nasal cavity of the subject.

In this embodiment at least the tip of the delivery channel 23 comprisesa tubular section of a flexible, preferably resilient, material. In apreferred embodiment the material is a semi-soft plastics material, suchas silicone rubber.

In this embodiment at least the tip of the delivery channel 23 has atapering section which narrows to the distal end thereof. The deliverychannel 23, in having a narrowing taper, acts, on insertion, to expandthe narrow nasal valve of the nasal cavity of the subject. In apreferred embodiment the delivery channel 23 has an elliptical section,preferably an oval section.

In a preferred embodiment the distal end of the outlet unit 21 isconfigured to extend at least about 2 cm, preferably at least about 3cm, and more preferably from about 2 cm to about 3 cm, into the nasalcavity of the subject.

The nosepiece 17 further comprises at least one expandable cuff member27 for expansion in the nasal cavity of the subject. In this embodimentthe at least one cuff member 27 comprises an inflatable member.

In this embodiment the at least one cuff member 27 is in fluidcommunication with the delivery channel 23, whereby the air flowgenerated by the subject on exhalation through the mouthpiece 19 acts toinflate the at least one cuff member 27. In an alternative embodimentthe delivery device could include a separate pump unit for inflating theat least one cuff member 27 subsequent to fitting of the nosepiece 17,and in a preferred embodiment subsequent to, preferably in response to,exhalation through the mouthpiece 19.

In this embodiment the at least one cuff member 27 is an inflatablemember which is inflated on exhalation by the subject. In an alternativeembodiment the at least one cuff member 27 could be inflated on thenosepiece 17 being located in the correct position.

In this embodiment the at least one cuff member 27 comprises a flexibleballoon element which is inflated by the generation of a pressure in thedelivery channel 23, with the at least one cuff member 27 deflating onthe release of pressure from the delivery channel 23. In the alternativeembodiment, where the at least one cuff member 27 is inflated by aseparate pump unit, the at least one cuff member 27 could equally bedeflated by the evacuation of gas therefrom using the same pump unit.

In one embodiment the at least one cuff member 27 could comprise aresilient balloon element which is inflated by the generation of apressure in the delivery channel 23, with the at least one cuff member27 returning to the original, deflated configuration on the release ofpressure from the delivery channel 23.

In another embodiment the at least one cuff member 27 could comprise aninflatable sponge element, in one embodiment a foam element having anencapsulating sealing layer, which can be compressed, in this embodimentby evacuation, to adopt a compact configuration to allow for insertioninto a nasal cavity of the subject and inflated, in this embodiment bybreaking the vacuum, to allow for the introduction of a gas into theporous structure of the sponge element. In one embodiment such a cuffmember 27 could be in selective fluid communication with the atmosphere.In another embodiment such a cuff member 27 could be in selective fluidcommunication with the delivery channel 23, whereby the pressuredeveloped in the delivery channel 23 would assist in the inflation ofthe cuff member 27. In the alternative embodiment which includes aseparate pump unit, the pump unit could be employed to assist ininflating such a cuff member 27 and in deflating the cuff member 27 bythe evacuation of gas therefrom. In one embodiment the inflation couldbe triggered on exhalation by the subject. In another embodiment theinflation could be triggered on the nosepiece 17 being located in thecorrect position in the nasal cavity of the subject.

The at least one cuff member 27 is disposed to an outer surface of theoutlet unit 21 such as, on expansion, to engage the inner wall of thenasal cavity of the subject. The at least one cuff member 27, in beingexpandable, provides for the expansion of the narrow nasal valve of thenasal cavity of the subject, the sealing of the nosepiece 17 in thenasal cavity of the subject, and the positioning, in particular thedirection, of the outlet unit 21 in the nasal cavity of the subject.

In this embodiment the at least one cuff member 27 comprises a singleannular cuff member 27 which is located about the outlet unit 21 such asto provide a seal between the delivery channel 23 and the inner wall ofthe nasal cavity of the subject when inflated.

In an alternative embodiment the at least one cuff member 27 couldcomprise a plurality of cuff members 27 which together provide a sealbetween the delivery channel 23 and the inner wall of the nasal cavityof the subject when inflated.

The delivery device further comprises a substance supply unit 29 fordelivering metered doses of a substance, in this embodiment an aerosolcanister for delivering metered volumes of a propellant, preferably ahydrofluoroalkane (HFA) propellant or the like, containing medicament,either as a suspension or solution, which is fluidly connected to thenozzle 25 to deliver substance from the nosepiece 17, in this embodimentas an aerosol spray.

In this embodiment the substance supply unit 29 is a multi-dose unit fordelivering a plurality of metered doses of substance. In anotherembodiment the substance supply unit 29 could be a single-dose unit fordelivering a single metered dose of substance.

The substance supply unit 29 is pre-primeable, in this embodiment byloading a resilient element, and includes a breath-actuated releasemechanism 31 which, when triggered, releases the resilient element andactuates the substance supply unit 29 to deliver a metered dose of asubstance through the nozzle 25.

In this embodiment the trigger mechanism 31 is configured to causeactuation of the substance supply unit 29 on generation of apredetermined flow rate through the delivery channel 23.

In another embodiment the trigger mechanism 31 could be configured tocause actuation of the substance supply unit 29 on generation of apredetermined pressure within the delivery channel 23.

In a further embodiment the trigger mechanism 31 could be configured tocause actuation of the substance supply unit 29 on generation of eitherone of a predetermined flow rate through the delivery channel 23 or apredetermined pressure within the delivery channel 23.

In an alternative embodiment the substance supply unit 29 could comprisea mechanical delivery pump, in particular a liquid delivery pump or apowder delivery pump, which delivers metered doses of a substance onactuation thereof.

In another alternative embodiment the substance supply unit 29 couldcomprise a dry powder delivery unit which delivers metered doses of asubstance, as a dry powder, on actuation thereof.

In yet another alternative embodiment the substance supply unit 29 couldcomprise a nebulizer which delivers metered doses of a substance, as anaerosol spray, on actuation thereof.

Operation of the delivery device will now be described hereinbelow withreference to FIGS. 14 to 16 of the accompanying drawings.

Referring to FIG. 14, the nosepiece 17 is first inserted into one of thenasal cavities of a subject until the guide member 20 abuts the nares ofthe nostril, at which point the distal end of the outlet unit 21 extendsabout 2 cm into the nasal cavity of the subject, and the mouthpiece 19is gripped in the lips of the subject.

The subject then begins to exhale through the mouthpiece 19, whichexhalation acts to close the oropharyngeal velum of the subject anddrive an air flow through the delivery channel 23 of the outlet unit 21,with the air flow passing into the one nasal cavity, around theposterior margin of the nasal septum and out of the other nasal cavity,thereby achieving a bi-directional air flow through the nasal airway ofthe subject. Exhalation through the mouthpiece 19 acts to develop apressure in the delivery channel 23, which pressure acts to inflate theat least one cuff member 27. As illustrated in FIG. 15, the expansion ofthe at least one cuff member 27 acts to expand the nasal valve in thenasal cavity, seal the delivery channel 23 to the inner wall of thenasal cavity, and position the outlet unit 21 in relation to the nasalcavity of the subject. As will be noted from FIG. 15, the outlet unit 21is forced to adopt the required position by the at least one cuff member27, in this embodiment as accommodated by flexing of the outlet unit 21.

In this embodiment, when the flow rate developed through the deliverychannel 23 reaches a predetermined value, the release mechanism 31 istriggered to actuate the substance supply unit 29 to deliver a metereddose of a substance to the nozzle 25 and into the nasal cavity of thesubject. In the alternative embodiment the release mechanism 31 could betriggered on the generation of a predetermined pressure in the deliverychannel 23.

Following exhalation, the pressure in the delivery channel 23 decreasesand the at least one cuff member 27 deflates, as illustrated in FIG. 16,at which point the mouthpiece 19 is released and the nosepiece 17withdrawn from the nasal cavity of the subject.

In one embodiment, where the delivery device is a single-dose device,the device can be discarded.

In another embodiment, where the delivery device is a multi-dose device,the device is ready for further use following priming of the substancesupply unit 29. In a preferred embodiment, where the nosepiece 17 isreplaceable, the nosepiece 17 can be replaced with a new nosepiece 17.

FIGS. 17 to 20 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a second embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described first embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating like parts

The delivery device of this embodiment differs from that of theabove-described first embodiment in further comprising an oralexhalation breath-actuatable gas supply unit 33 for delivering a gasflow through the delivery channel 23 of the outlet unit 21 in responseto exhalation by a subject, and in that the mouthpiece 19 is in fluidcommunication with the gas supply unit 33 and not the delivery channel23 of the outlet unit 21, whereby a gas flow is delivered to thedelivery channel 23 of the outlet unit 21, and hence the nasal airway ofthe subject, in response to exhalation through the mouthpiece 19.

Operation of the delivery device is the same as for the above-describedfirst embodiment, with a gas flow being delivered to the deliverychannel 23 of the outlet unit 21 in response to exhalation through themouthpiece 19.

FIGS. 21 to 24 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a third embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described first embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described first embodiment only in that the nosepiece 17 comprisesa plurality of, in this embodiment two, inflatable cuff members 27 a, 27b. This arrangement of cuff members 27 a, 27 b enables the distalmostcuff member 27 b to have a reduced size, and thereby facilitatesinsertion of the outlet unit 21 through the narrow nasal valve in thenasal cavity of the subject.

Operation of the delivery device is the same as for the above-describedfirst embodiment.

FIGS. 25 to 27 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a fourth embodiment of the present invention.

The delivery device comprises a housing 35, a nosepiece 37 for fittingin a nasal cavity of a subject, and a mouthpiece 39 through which thesubject exhales to actuate the delivery device.

The nosepiece 37 comprises a guide member 40, in this embodiment afrusto-conical element, for guiding the nosepiece 37 into the nasalcavity of the subject, and an outlet unit 41 for delivering substanceinto the nasal airway of the subject. In this embodiment the nosepiece37 is a replaceable unit.

In this embodiment the outlet unit 41 comprises a delivery channel 43which is in fluid communication with the mouthpiece 39 such that an airflow is delivered into and through the nasal airway of the subject onexhalation by the subject through the mouthpiece 39, and a nozzle 45 fordelivering substance into the nasal cavity of the subject. In thisembodiment the nozzle 45 is disposed in the delivery channel 43co-axially with the same. In this embodiment the nozzle 45 is configuredto provide an aerosol spray. In an alternative embodiment, for thedelivery of a liquid, the nozzle 45 could be configured to deliver aliquid jet as a column of liquid.

In this embodiment at least the tip of the delivery channel 43 comprisesa tubular section of a flexible, preferably resilient, material. In apreferred embodiment the material is a semi-soft plastics material, suchas silicone rubber.

In this embodiment at least the tip of the delivery channel 43 has atapering section which narrows to the distal end thereof. The deliverychannel 43, in having a narrowing taper, acts, on insertion, to expandthe narrow nasal valve of the nasal cavity of the subject. In apreferred embodiment the delivery channel 43 has an elliptical section,preferably an oval section.

In a preferred embodiment the outlet unit 41 is configured to extend atleast about 2 cm, preferably at least about 3 cm, and more preferablyfrom about 2 cm to about 3 cm, into the nasal cavity of the subject.

The nosepiece 37 further comprises at least one cuff member 47 forfitting in the nasal cavity of the subject. In this embodiment the atleast one cuff member 47 is a resilient member which is deformable toallow for insertion into the nasal cavity of the subject and, oninsertion, expansion to adopt the required position in the nasal cavity,in which position the outlet unit 41 is correctly positioned. When sopositioned, the at least one cuff member 47 provides for the expansionof the narrow nasal valve in the nasal cavity, the sealing of the outletunit 41 in the nasal cavity, and the positioning, in particular thedirection, of the outlet unit 41 in the nasal cavity of the subject. Inthis embodiment the at least one cuff member 47 comprises a spongemember, here a foam member. In an alternative embodiment the at leastone cuff member 47 could comprise a gel-filled member, such as asilicone-filled member.

In this embodiment the at least one cuff member 47 is configured suchthat, when inserted in the nasal cavity, the outlet unit 41 is directedat a lower region of the nasal cavity of the subject. In preferredembodiments the at least one cuff member 47 can be configured to directthe outlet unit 41 at any region of the inferior meatus and the inferiorregion of the middle meatus, whereby substance can be targeted inparticular at the inferior nasal concha, and the adenoids and tubalostia in the superior region of the epipharynx.

Regions in the nasal airway adjacent the inferior meatus and theinferior region of the middle meatus represent the regions in the nasalairway which provide the path of least flow resistance therethrough.With existing nasal spray systems, the delivery is such that thedelivered substance flows along the floor of the nasal cavity, with theresult that the substance does not reach the adenoids or the tubalostia.

In this embodiment the at least one cuff member 47 includes at least onelobe 54, here a single lobe 54, which is configured such as to extendinto, and thereby obstruct, an upper region of the nasal cavity of thesubject, the at least one lobe 54 acting to force the delivered flow tofollow a flow path defined by the inferior meatus and the inferiorregion of the middle meatus. The achievement of such a flow path, alliedwith an optimization of the particle size distribution, provides that amuch larger fraction of substance can be delivered to sites in theinferior meatus and the inferior region of the middle meatus.

In this embodiment the at least one cuff member 47 comprises a singleannular cuff member 47 which is disposed about the outlet unit 41.

In an alternative embodiment the at least one cuff member 47 couldcomprise a plurality of cuff members 47 which are disposed about theoutlet unit 41.

The delivery device further comprises a substance supply unit 49 fordelivering metered doses of a substance, in this embodiment an aerosolcanister for delivering metered volumes of a propellant, preferably ahydrofluoroalkane (HFA) propellant or the like, containing medicament,either as a suspension or solution, which is fluidly connected to thenozzle 45 to deliver substance from the nosepiece 37, in this embodimentas an aerosol spray.

In this embodiment the substance supply unit 49 is a multi-dose unit fordelivering a plurality of metered doses of substance. In anotherembodiment the substance supply unit 49 could be a single-dose unit fordelivering a single metered dose of substance.

The substance supply unit 49 is pre-primeable, in this embodiment byloading a resilient element, and includes a breath-actuated releasemechanism 51 which, when triggered, releases the resilient element andactuates the substance supply unit 49 to deliver a metered dose of asubstance through the nozzle 45.

In this embodiment the trigger mechanism 51 is configured to causeactuation of the substance supply unit 49 on generation of apredetermined flow rate through the delivery channel 43.

In another embodiment the trigger mechanism 51 could be configured tocause actuation of the substance supply unit 49 on generation of apredetermined pressure within the delivery channel 43.

In a further embodiment the trigger mechanism 51 could be configured tocause actuation of the substance supply unit 49 on generation of eitherone of a predetermined flow rate through the delivery channel 43 or apredetermined pressure within the delivery channel 43.

In an alternative embodiment the substance supply unit 49 could comprisea mechanical delivery pump, in particular a liquid delivery pump or apowder delivery pump, which delivers metered doses of a substance onactuation thereof.

In another alternative embodiment the substance supply unit 49 couldcomprise a dry powder delivery unit which delivers metered doses of asubstance, as a dry powder, on actuation thereof.

In yet another alternative embodiment the substance supply unit 49 couldcomprise a nebulizer which delivers metered doses of a substance, as anaerosol spray, on actuation thereof.

Operation of the delivery device will now be described hereinbelow withreference to FIGS. 26 and 27 of the accompanying drawings.

Referring to FIG. 26, the nosepiece 37 is first inserted into a nasalcavity of a subject until the guide member 40 abuts the nares of thenostril, at which point the distal end of the outlet unit 41 extendsabout 2 cm into the nasal cavity of the subject, and the mouthpiece 39is gripped in the lips of the subject.

The subject then begins to exhale through the mouthpiece 39, whichexhalation acts to close the oropharyngeal velum of the subject anddrive an air flow through the delivery channel 43 of the outlet unit 41,with the air flow passing into the one nasal cavity, around theposterior margin of the nasal septum and out of the other nasal cavity,thereby achieving a bi-directional air flow through the nasal airway ofthe subject.

In this embodiment, when the flow rate developed through the deliverychannel 43 reaches a predetermined value, the release mechanism 51 istriggered to actuate the substance supply unit 49 to deliver a metereddose of a substance to the nozzle 45 and into the nasal cavity of thesubject. In the alternative embodiment the release mechanism 51 could betriggered on the generation of a predetermined pressure in the deliverychannel 43.

Following exhalation, the mouthpiece 39 is released and the nosepiece 37withdrawn from the nasal cavity of the subject.

In one embodiment, where the delivery device is a single-dose device,the device can be discarded.

In another embodiment, where the delivery device is a multi-dose device,the device is ready for further use following priming of the substancesupply unit 49. In a preferred embodiment, where the nosepiece 37 isreplaceable, the nosepiece 37 can be replaced with a new nosepiece 37.

FIGS. 28 to 30 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a fifth embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described fourth embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described fourth embodiment only in the configuration of theoutlet unit 41 and the at least one cuff member 47.

In this embodiment the at least one cuff member 47 is configured suchthat, when inserted in the nasal cavity of the subject, the outlet unit41 is directed at a middle region of the nasal cavity of the subject. Ina preferred embodiment the at least one cuff member 47 can be configuredto direct the outlet unit 41 at any region of the middle meatus and theinferior region of the superior meatus, whereby substance can betargeted in particular at the middle nasal concha, the sinusinfundibulum and the sinus ostia.

The middle meatus is the region of the nasal cavity located under andlateral to the middle nasal concha, with the sinus infundibulum and thesinus ostia representing the sites of the main pathologies in many verycommon diseases, such as chronic sinusitis, which affects about 10 to15% of the population and has no FDA approved treatment, and nasalpolyposis. The only known treatment of these conditions is theapplication of drops during a rigorous and complex procedure involvingsevere neck extension and the so-called “Mecca” position. As will beappreciated, however, owing to the complicated and often painfulprocedure, compliance is very poor. Existing nasal spray systems areineffective in delivering substance to this region of the nasal cavity.

In this embodiment the at least one cuff member 47 includes upper andlower lobes 54 a, 54 b which are configured such as to extend into, andthereby obstruct, respective ones of the upper and lower regions of thenasal cavity of the subject, the lobes 54 a, 54 b acting to force adelivered flow to follow a flow path defined by the middle meatus andthe inferior region of the superior meatus. The achievement of such aflow path, allied with an optimization of the particle sizedistribution, provides that a much larger fraction of substance can bedelivered to sites in the middle meatus and the inferior region of themiddle meatus.

Operation of the delivery device is the same as for the above-describedfourth embodiment.

FIGS. 31 to 33 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a sixth embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described fourth embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described fourth embodiment only in the configuration of theoutlet unit 41 and the at least one cuff member 47.

In this embodiment the at least one cuff member 47 is configured suchthat, when inserted in the nasal cavity of the subject, the outlet unit41 is directed at a superior region of the nasal cavity of the subject.In a preferred embodiment the at least one cuff member 47 can beconfigured to direct the outlet unit 41 at any region of the superiormeatus, and in particular provide for the targeting of the superiornasal concha and the olfactory region.

The olfactory region is located in the superior region of the nasalcavity and typically has a surface area of from about 4 to 6 cm². Theolfactory region represents the only region where it is possible tocircumvent the blood-to-brain barrier (BBB) and enable communicationwith the cerebrospinal fluid (CSF) and the brain. Such delivery isnecessary to enable effective treatment of neurological diseases, suchas Alzheimer's and Parkinson's disease, psychiatric diseases andintracerebral infections.

The olfactory region is reached through narrow slit-like passages andthe delivery of substance to this region is not possible using existingnasal delivery systems.

In existing nasal spray systems, substantially all of the particles arefar too large to pass through the passages in communication with theolfactory region. Indeed, such spray systems are specifically designedto deliver particles having an average diameter of greater than 10 μm inorder to comply with the FDA requirements which require that the maximumfraction of particles having a diameter of less than 10 μm be 5% of thetotal fraction. The reason for this requirement is that, where the velumis not closed, as would be the case where a subject inhales through thenose as prescribed for delivery, particles having a diameter of lessthan 10 μm could escape from the nasal cavity and be inhaled into thelungs.

In addition, in existing nasal spray systems, the flow characteristicsof particles delivered into the nasal cavity are not suited to enabledelivery through the passages communicating with the olfactory region.

Furthermore, the sniffing action by a subject during delivery causes theparticles to be drawn into the inferior and middle regions of the nasalcavity, where the flow resistance is the lowest, with only a minimalfraction, if any, of the particles being delivered to the olfactoryregion.

In this embodiment, by ensuring closure of the velum in delivery andoptimizing both the particle size distribution so as to include a largerfraction of smaller particles, typically having a particle size of lessthan 10 μm, and the aerodynamic delivery conditions, the delivery deviceprovides for the effective delivery of substance to the olfactoryregion.

Such a delivery regime has not previously been known, and has beenrecognised by the present applicant as providing an improved deliverydevice and delivery method.

In this embodiment the at least one lobe 54 of the at least one cuffmember 47 is configured such as to extend into, and thereby obstruct, alower region of the nasal cavity of the subject, the at least one lobe54 acting to force a delivered flow to follow a flow path defined by thesuperior meatus and in particular the olfactory region. The achievementof such a flow path, allied with an optimization of the particle sizedistribution, provides that a much larger fraction of substance can bedelivered to sites in the superior meatus and in particular theolfactory region.

Operation of the delivery device is the same as for the above-describedfourth embodiment.

FIGS. 34 to 37 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a seventh embodiment of the present invention.

The delivery device comprises a housing 55, a nosepiece 57 for fittingin a nasal cavity of a subject, and a mouthpiece 59 through which thesubject exhales to actuate the delivery device.

The nosepiece 57 comprises a guide member 60, in this embodiment afrusto-conical element, for guiding the nosepiece 57 into a nasal cavityof the subject, and an outlet unit 61 for delivering substance into thenasal airway of the subject. In this embodiment the nosepiece 57 is areplaceable unit.

In this embodiment the outlet unit 61 comprises a delivery channel 63which is in fluid communication with the mouthpiece 59 such that an airflow is delivered into and through the nasal airway of the subject onexhalation by the subject through the mouthpiece 59, and a nozzle 65 fordelivering substance to the nasal airway of the subject. In thisembodiment the nozzle 65 is disposed in the delivery channel 63co-axially with the same. In this embodiment the nozzle 65 is configuredto provide an aerosol spray. In an alternative embodiment, for thedelivery of a liquid, the nozzle 65 could be configured to deliver aliquid jet as a column of liquid.

In this embodiment the outlet unit 61 is movably coupled to the housing55, here as provided by a flexible coupling, such as to allow for thepositioning of the outlet unit 61 in the nasal cavity of the subject, aswill be described in more detail hereinbelow.

In an alternative embodiment the outlet unit 61 could be fixed to thehousing 55, and the mouthpiece 59 instead movably coupled to the housing55, here as provided by a flexible coupling, such as to allow for thepositioning of the outlet unit 61 in the nasal cavity of the subject.

In this embodiment at least the tip of the delivery channel 63 comprisesa tubular section of a flexible, preferably resilient, material. In apreferred embodiment the material is a semi-soft plastics material, suchas silicone rubber.

In this embodiment at least the tip of the delivery channel 63 has atapering section which narrows to the distal end thereof. The deliverychannel 63, in having a narrowing taper, acts, on insertion, to expandthe narrow nasal valve of the nasal cavity of the subject. In apreferred embodiment the delivery channel 63 has an elliptical section,preferably an oval section.

In a preferred embodiment the distal end of the outlet unit 61 isconfigured to extend at least about 2 cm, preferably at least about 3cm, and more preferably from about 2 cm to about 3 cm, into the nasalcavity of the subject.

The nosepiece 57 further comprises at least one expandable cuff member67 for expansion in the nasal cavity of the subject. In this embodimentthe at least one cuff member 67 comprises an inflatable member.

In this embodiment the at least one cuff member 67 is in fluidcommunication with the delivery channel 63, whereby the air flowgenerated by the subject on exhalation through the mouthpiece 59 acts toinflate the at least one cuff member 67. In an alternative embodimentthe delivery device could include a separate pump unit for inflating theat least one cuff member 67 subsequent to fitting of the nosepiece 57,and in a preferred embodiment subsequent to, preferably in response to,exhalation through the mouthpiece 59.

In this embodiment the at least one cuff member 67 is an inflatablemember which is inflated on exhalation by the subject. In an alternativeembodiment the at least one cuff member 67 could be inflated on thenosepiece 57 being located in the correct position.

In this embodiment the at least one cuff member 67 comprises a flexibleballoon element which is inflated by the generation of a pressure in thedelivery channel 63, with the at least one cuff member 67 deflating onthe release of pressure from the delivery channel 63. In the alternativeembodiment, where the at least one cuff member 67 is inflated by aseparate pump unit, the at least one cuff member 67 could equally bedeflated by the evacuation of gas therefrom using the same pump unit.

In one embodiment the at least one cuff member 67 could comprise aresilient balloon element which is inflated by the generation of apressure in the delivery channel 63, with the at least one cuff member67 returning to the original, deflated configuration on the release ofpressure from the delivery channel 63.

In another embodiment the at least one cuff member 67 could comprise aninflatable sponge element, in one embodiment a foam element having anencapsulating sealing layer, which can be compressed, in this embodimentby evacuation, to adopt a compact configuration to allow for insertioninto a nasal cavity of the subject and inflated, in this embodiment bybreaking the vacuum, to allow for the introduction of a gas into theporous structure of the sponge element. In one embodiment such a cuffmember 67 could be in selective fluid communication with the atmosphere.In another embodiment such a cuff member 67 could be in selective fluidcommunication with the delivery channel 63, whereby the pressuredeveloped in the delivery channel 63 would assist in the inflation ofthe cuff member 67. In the alternative embodiment which includes aseparate pump unit, the pump unit could be employed to assist ininflating such a cuff member 67 and in deflating the cuff member 67 bythe evacuation of gas therefrom. In one embodiment the inflation couldbe triggered on exhalation by the subject. In another embodiment theinflation could be triggered on the nosepiece 57 being located in thecorrect position in the nasal cavity of the subject.

The at least one cuff member 67 is disposed to an outer surface of theoutlet unit 61 such as, on expansion, to engage the inner wall of thenasal cavity of the subject. The at least one cuff member 67, in beingexpandable, provides for the expansion of the narrow nasal valve of thenasal cavity of the subject, the sealing of the nosepiece 57 in thenasal cavity of the subject, and the positioning, in particular thedirection, of the outlet unit 61 in the nasal cavity of the subject.

In this embodiment the at least one cuff member 67 comprises a singleannular cuff member 67 which is located about the outlet unit 61 such asto provide a seal between the delivery channel 63 and the inner wall ofthe nasal cavity of the subject when inflated.

In an alternative embodiment the at least one cuff member 67 couldcomprise a plurality of cuff members 67 which together provide a sealbetween the delivery channel 63 and the inner wall of the nasal cavityof the subject when inflated.

In this embodiment the at least one cuff member 67 is configured suchthat, when inserted in the nasal cavity, the outlet unit 61 is directedat a lower region of the nasal cavity of the subject. In preferredembodiments the at least one cuff member 67 can be configured to directthe outlet unit 61 at any region of the inferior meatus and the inferiorregion of the middle meatus, whereby substance can be targeted inparticular at the inferior nasal concha, and the adenoids and tubalostia in the superior region of the epipharynx.

Regions in the nasal airway adjacent the inferior meatus and theinferior region of the middle meatus represent the regions in the nasalairway which provide the path of least flow resistance therethrough.With existing nasal spray systems, the delivery is such that thedelivered substance flows along the floor of the nasal cavity, with theresult that the substance does not reach the adenoids or the tubalostia.

In this embodiment the at least one cuff member 67 includes at least onelobe 74, here a single lobe 74, which is configured such as to extendinto, and thereby obstruct, an upper region of the nasal cavity of thesubject, the at least one lobe 74 acting to force the delivered flow tofollow a flow path defined by the inferior meatus and the inferiorregion of the middle meatus. The achievement of such a flow path, alliedwith an optimization of the particle size distribution, provides that amuch larger fraction of substance can be delivered to sites in theinferior meatus and the inferior region of the middle meatus.

In this embodiment the at least one cuff member 67 comprises a singleannular cuff member 67 which is disposed about the outlet unit 61.

In an alternative embodiment the at least one cuff member 67 couldcomprise a plurality of cuff members 67 which are disposed about theoutlet unit 61.

The delivery device further comprises a substance supply unit 69 fordelivering metered doses of a substance, in this embodiment an aerosolcanister for delivering metered volumes of a propellant, preferably ahydrofluoroalkane (HFA) propellant or the like, containing medicament,either as a suspension or solution, which is fluidly connected to thenozzle 65 to deliver substance from the nosepiece 57, in this embodimentas an aerosol spray.

In this embodiment the substance supply unit 69 is a multi-dose unit fordelivering a plurality of metered doses of substance. In anotherembodiment the substance supply unit 69 could be a single-dose unit fordelivering a single metered dose of substance.

The substance supply unit 69 is pre-primeable, in this embodiment byloading a resilient element, and includes a breath-actuated releasemechanism 71 which, when triggered, releases the resilient element andactuates the substance supply unit 69 to deliver a metered dose of asubstance through the nozzle 65.

In this embodiment the trigger mechanism 71 is configured to causeactuation of the substance supply unit 69 on generation of apredetermined flow rate through the delivery channel 63.

In another embodiment the trigger mechanism 71 could be configured tocause actuation of the substance supply unit 69 on generation of apredetermined pressure within the delivery channel 63.

In a further embodiment the trigger mechanism 71 could be configured tocause actuation of the substance supply unit 69 on generation of eitherone of a predetermined flow rate through the delivery channel 63 or apredetermined pressure within the delivery channel 63.

In an alternative embodiment the substance supply unit 69 could comprisea mechanical delivery pump, in particular a liquid delivery pump or apowder delivery pump, which delivers metered doses of a substance onactuation thereof.

In another alternative embodiment the substance supply unit 69 couldcomprise a dry powder delivery unit which delivers metered doses of asubstance, as a dry powder, on actuation thereof.

In yet another alternative embodiment the substance supply unit 69 couldcomprise a nebulizer which delivers metered doses of a substance, as anaerosol spray, on actuation thereof.

Operation of the delivery device will now be described hereinbelow withreference to FIGS. 35 to 37 of the accompanying drawings.

Referring to FIG. 35, the nosepiece 57 is first inserted into one of thenasal cavities of a subject until the guide member 60 abuts the nares ofthe nostril, at which point the distal end of the outlet unit 61 extendsabout 2 cm into the nasal cavity of the subject, and the mouthpiece 59is gripped in the lips of the subject.

The subject then begins to exhale through the mouthpiece 59, whichexhalation acts to close the oropharyngeal velum of the subject anddrive an air flow through the delivery channel 63 of the outlet unit 61,with the air flow passing into the one nasal cavity, around theposterior margin of the nasal septum and out of the other nasal cavity,thereby achieving a bi-directional air flow through the nasal airway ofthe subject. Exhalation through the mouthpiece 59 acts to develop apressure in the delivery channel 63, which pressure acts to inflate theat least one cuff member 67. As illustrated in FIG. 36, the expansion ofthe at least one cuff member 67 acts to expand the nasal valve in thenasal cavity, seal the delivery channel 63 to the inner wall of thenasal cavity, and position the outlet unit 61 in relation to the nasalcavity of the subject. As will be noted from FIG. 36, the outlet unit 61is forced to adopt the required position by the at least one cuff member67, in this embodiment as accommodated by flexing of the outlet unit 61.

In this embodiment, when the flow rate developed through the deliverychannel 63 reaches a predetermined value, the release mechanism 71 istriggered to actuate the substance supply unit 69 to deliver a metereddose of a substance to the nozzle 65 and into the nasal cavity of thesubject. In the alternative embodiment the release mechanism 71 could betriggered on the generation of a predetermined pressure in the deliverychannel 63.

Following exhalation, the pressure in the delivery channel 63 decreasesand the at least one cuff member 67 deflates, as illustrated in FIG. 37,at which point the mouthpiece 59 is released and the nosepiece 57withdrawn from the nasal cavity of the subject.

In one embodiment, where the delivery device is a single-dose device,the device can be discarded.

In another embodiment, where the delivery device is a multi-dose device,the device is ready for further use following priming of the substancesupply unit 69. In a preferred embodiment, where the nosepiece 57 isreplaceable, the nosepiece 57 can be replaced with a new nosepiece 57.

FIGS. 38 to 41 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with an eighth embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described seventh embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described seventh embodiment only in the configuration of theoutlet unit 61 and the at least one cuff member 67.

In this embodiment the at least one cuff member 67 is configured suchthat, when inserted in the nasal cavity of the subject, the outlet unit61 is directed at a middle region of the nasal cavity of the subject. Ina preferred embodiment the at least one cuff member 67 can be configuredto direct the outlet unit 61 at any region of the middle meatus and theinferior region of the superior meatus, whereby substance can betargeted in particular at the middle nasal concha, the sinusinfundibulum and the sinus ostia.

The middle meatus is the region of the nasal cavity located under andlateral to the middle nasal concha, with the sinus infundibulum and thesinus ostia representing the sites of the main pathologies in many verycommon diseases, such as chronic sinusitis, which affects about 10 to15% of the population and has no FDA approved treatment, and nasalpolyposis. The only known treatment of these conditions is theapplication of drops during a rigorous and complex procedure involvingsevere neck extension and the so-called “Mecca” position. As will beappreciated, however, owing to the complicated and often painfulprocedure, compliance is very poor. Existing nasal spray systems areineffective in delivering substance to this region of the nasal cavity.

In this embodiment the at least one cuff member 67 includes upper andlower lobes 74 a, 74 b which are configured such as to extend into, andthereby obstruct, respective ones of the upper and lower regions of thenasal cavity of the subject, the lobes 74 a, 74 b acting to force adelivered flow to follow a flow path defined by the middle meatus andthe inferior region of the superior meatus. The achievement of such aflow path, allied with an optimization of the particle sizedistribution, provides that a much larger fraction of substance can bedelivered to sites in the middle meatus and the inferior region of themiddle meatus.

Operation of the delivery device is the same as for the above-describedseventh embodiment.

FIGS. 42 to 45 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a ninth embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described seventh embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described seventh embodiment only in the configuration of theoutlet unit 61 and the at least one cuff member 67.

In this embodiment the at least one cuff member 67 is configured suchthat, when inserted in the nasal cavity of the subject, the outlet unit61 is directed at a superior region of the nasal cavity of the subject.In a preferred embodiment the at least one cuff member 67 can beconfigured to direct the outlet unit 61 at any region of the superiormeatus, and in particular provide for the targeting of the superiornasal concha and the olfactory region.

The olfactory region is located in the superior region of the nasalcavity and typically has a surface area of: from about 4 to 6 cm². Theolfactory region represents the only region where it is possible tocircumvent the blood-to-brain barrier (BBB) and enable communicationwith the cerebrospinal fluid (CSF) and the brain. Such delivery isnecessary to enable effective treatment of neurological diseases, suchas Alzheimer's and Parkinson's disease, psychiatric diseases andintracerebral infections.

The olfactory region is reached through narrow slit-like passages andthe delivery of substance to this region is not possible using existingnasal delivery systems.

In existing nasal spray systems, substantially all of the particles arefar too large to pass through the passages in communication with theolfactory region. Indeed, such spray systems are specifically designedto deliver particles having an average diameter of greater than 10 μm inorder to comply with the FDA requirements which require that themaximum: fraction of particles having an average diameter of less than10 μm be 5% of the total fraction. The reason for this requirement isthat, where the velum is not closed, as would be the case where asubject inhales through the nose as prescribed for delivery, particleshaving an average diameter of less than 10 μm could escape from thenasal cavity and be inhaled into the lungs.

In addition, in existing nasal spray systems, the flow rate of particlesdelivered into the nasal cavity is too great to enable delivery throughthe passages communicating with the olfactory region.

Furthermore, inhalation by a subject during delivery causes theparticles to be drawn into the inferior and middle regions of the nasalcavity, where the flow resistance is the lowest, with only a minimalfraction, if any, of the particles being delivered to the olfactoryregion.

In this embodiment, by ensuring closure of the velum in delivery andoptimizing both the particle size distribution so as to include a largerfraction of smaller particles, typically having a particle size of lessthan 10 μm, and the aerodynamic delivery conditions, the delivery deviceprovides for the effective delivery of substance to the olfactoryregion. Such a delivery regime has not previously been known, and hasbeen recognised by the present applicant as providing an improveddelivery device and delivery method.

In this embodiment the at least one lobe 74 of the at least one cuffmember 67 is configured such as to extend into, and thereby obstruct, alower region of the nasal cavity of the subject, the at least one lobe74 acting to force a delivered flow to follow a flow path defined by thesuperior meatus and in particular the olfactory region. The achievementof such a flow path, allied with an optimization of the particle sizedistribution, provides that a much larger fraction of substance can bedelivered to sites in the superior meatus and in particular theolfactory region.

Operation of the delivery device is the same as for the above-describedseventh embodiment.

FIGS. 36 to 50 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a tenth embodiment of the present invention.

The delivery device comprises a housing 75, a nosepiece 77 for fittingin a nasal cavity of a subject, and a mouthpiece 79 through which thesubject exhales to actuate the delivery device.

The nosepiece 77 comprises a cuff member 80, in this embodiment afrusto-conical element, for positioning the nosepiece 77 in the nasalcavity of the subject and providing a fluid-tight seal therewith, and anoutlet unit 81 for delivering substance into the nasal airway of thesubject.

In this embodiment the outlet unit 81 comprises a nozzle 82 from whichsubstance is delivered into the nasal cavity of the subject, and adelivery channel 83 through which a gas flow, separate from theexhalation breath of the subject, is delivered to interact with thesubstance delivered from the nozzle 82. This configuration, ininteracting with the substance and altering the characteristics of thedelivered substance, advantageously provides for improved delivery ofthe substance.

In this embodiment the nozzle 82 is configured to provide an aerosolspray. In an alternative embodiment, for the delivery of a liquid, thenozzle 82 could be configured to deliver a liquid jet as a column ofliquid.

In this embodiment the nozzle 82 is disposed in the delivery channel 83co-axially with the same. In this embodiment the delivery channel 83 isan annular channel which surrounds the nozzle 82 such as to define anannular gas flow which interacts with the substance delivered from thenozzle 82.

The delivery device further comprises a substance supply unit 85 whichis fluidly connected to the nozzle 82 such as to deliver a metered doseof a substance on actuation thereof. In this embodiment the substancesupply unit 85 comprises a mechanical pump for delivering a metered doseof a substance on actuation thereof.

The delivery device further comprises a gas supply unit 87 which isfluidly connected to the delivery channel 83 for supplying a gas flowtherethrough. The gas supply unit 87 comprises a cylinder 89, a piston91 which is movably disposed within the cylinder 89 and defines achamber 93 forward thereof which contains a gas, with a volume of thecontained gas, typically about 5 ml, being expelled from the chamber 93on actuation of the gas supply unit 87.

The delivery device further comprises a driving unit 95 which isactuatable to actuate the substance supply unit 85 and the gas supplyunit 87.

The driving unit 95 comprises a drive member 97, in this embodiment ablock, which is coupled, here commonly coupled, to the body of thesubstance supply unit 85 and the piston 91 of the gas supply unit 87 andmovable between a first, rest position (as illustrated in FIGS. 46 to49). in which the substance supply unit 85 and the gas supply unit 87are in the non-actuated positions and a second, actuated position (asillustrated in FIG. 50) in which the body of the substance supply unit85 and the piston 91 of the gas supply unit 87 are advanced to theactuated positions, and a return biasing element 99, in this embodimenta resilient element, particularly a compression spring, for returningthe drive member 97 to the rest position.

The driving unit 95 further comprises a load biasing element 101, inthis embodiment a resilient element, particularly a compression spring,for biasing the drive member 97 in an actuating direction when in therest position, and a loading member 103, in this embodiment a lever, forloading the load biasing element 101 such as to bias the drive member 97when in the rest position with an actuation force. The loading member103 is movable between a first, inoperative position (as illustrated inFIG. 46) in which the load biasing element 101 is not loaded thereby,and a second, operative position (as illustrated in FIGS. 47 to 49) inwhich the biasing element 101, when restrained, loads the drive member97 with the actuation force.

The delivery device further comprises a trigger mechanism 105 which isconfigured normally to lock the drive member 97 of the driving unit 95in the rest position and release the same on exhalation by the subjectthrough the mouthpiece 79, which drive member 97, when loaded by theload biasing element 101, once released acts commonly to actuate thesubstance supply unit 85 and the gas supply unit 87.

In this embodiment the trigger mechanism 105 is configured to causeactuation of the driving unit 95 on generation of a predetermined flowrate through the mouthpiece 79.

In another embodiment the trigger mechanism 105 could be configured tocause actuation of the driving unit 95 on generation of a predeterminedpressure within the mouthpiece 79.

In this embodiment the trigger mechanism 105 comprises a linkageassembly 107 which includes first and second link elements 109, 111, anda biasing element 112, in this embodiment a resilient element,particularly a tension spring, for biasing the linkage assembly 107 to alocking configuration (as illustrated in FIGS. 46 to 48) in which thelinkage assembly 107 acts to lock the drive member 97 of the drivingunit 95 in the rest position and prevent movement thereof when loaded bythe load biasing element 101.

One of the link elements 109 includes a pivot 113 about which the sameis rotatable, and first and second arms 115, 117. One of the arms 115extends into the mouthpiece 79 and, when the linkage assembly 107 is inthe locking configuration, is biased to a rest position (as illustratedin FIGS. 46 to 48) in which the flow path through the mouthpiece 79 issubstantially closed, the one arm 115 thereby providing a vane to beacted upon by the exhalation breath of the subject.

The other of the link elements 111 is pivotally coupled at one end tothe distal end of the other, second arm 117 of the first link element109 and at the other end to the drive member 97 of the driving unit 95;the second arm 117 of the first link element 109 being angularlypositioned relative to the first arm 115 thereof such that, when thelinkage assembly 107 is in the locking configuration, the second arm 117of the first link element 109 and the second link element 111 enclose anangle of less than 180 degrees on the side opposite to the first arm 115of the first link element 109, whereby the second arm 117 of the firstlink element 109 and the second link element 111 are over-centered andsupport the drive member 97 of the driving unit 95 when loaded.

Operation of the delivery device will now be described hereinbelow withreference to FIGS. 47 to 50 of the accompanying drawings.

In a first step, as illustrated in FIG. 47, the loading member 103 isoperated to bias the biasing element 101 and load the drive member 97 ofthe driving unit 95 with the actuation force.

Referring to FIG. 48, the nosepiece 77 is then first inserted into anasal cavity of a subject until the cuff member 80 is fitted in thenares of the nostril, at which point the distal end of the outlet unit81 extends about 2 cm into the nasal cavity of the subject, and themouthpiece 79 is gripped in the lips of the subject.

The subject then begins to exhale through the mouthpiece 79, whichexhalation acts to close the oropharyngeal velum of the subject anddrive an air flow over the first arm 115 of the first link element 109of the linkage assembly 107 which extends into the mouthpiece 79. Whilethe flow rate developed is not sufficient to actuate the triggermechanism 105, the linkage assembly 107 of the trigger mechanism 105acts to retain the drive member 97 of the driving unit 95 in the lockedposition, whereby the substance supply unit 85 and the gas supply unit87 are not actuated. When the flow rate developed reaches apredetermined value, as illustrated in FIG. 49, the rotation of thefirst arm 115 of the first link element 109 is such as to rotate thesecond arm 117 of the first link element 109 to a position in which thesupport provided together with the second link element 111 is unstableand collapses. Referring to FIG. 50, this collapse of the linkageassembly 107 enables the drive member 97 of the driving unit 95 to bemoved by the load biasing element 101 to the actuated position, whichmovement actuates the substance supply unit 85 to deliver a metered doseof a substance through the nozzle 82 and the gas supply unit 87 todeliver a metered volume of a gas through the delivery channel 83, whichgas flow interacts with the delivered substance to modify thecharacteristics of the delivered substance, and thereby provide forimproved delivery to the nasal airway of the subject.

Following actuation, the mouthpiece 79 is released and the nosepiece 77is withdrawn from the nasal cavity of the subject.

The loading member 103 of the driving unit 95 is then returned to theinoperative position, and the drive member 97 of the driving unit 95 isreturned to the rest position by the return biasing element 99. Thereturn of the drive member 97 to the rest position causes the body ofthe substance supply unit 85 and the piston 91 of the gas supply unit 87to be returned to the rest positions.

Following the return of the drive member 97 to the rest position, thelinkage assembly 107 again adopts the locking configuration, with thelinkage assembly 107 being maintained in the locking configuration bythe linkage biasing element 112. In this configuration, the deliverydevice is ready for further use.

FIGS. 51 to 56 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with an eleventh embodiment of the presentinvention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described tenth embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described tenth embodiment only in the configuration of thedriving unit 95.

In this embodiment the drive member 97 of the drive unit 95 is notconfigured to commence actuation of the substance supply unit 85 and thegas supply unit 87 at the same instant as in the above-described tenthembodiment, but rather is configured such that actuation of the gassupply unit 87 is commenced prior to the actuation of the substancesupply unit 85, whereby an interacting gas flow is delivered from thedelivery channel 83 of the outlet unit 81 prior to the delivery ofsubstance from the nozzle 82 and then during the delivery of substancefrom the nozzle 82 such as to interact with the same.

In this embodiment the delayed actuation of the substance supply unit 85is achieved by configuring the drive member 97 such as to be spaced fromthe body of the substance supply unit 85 when the drive member 97 is inthe rest position, whereby the drive member 97 has to be advanced apredetermined distance, corresponding to a predetermined time period,prior to common actuation of the substance supply unit 85 and the gassupply unit 87. In this embodiment the substance supply unit 85 includesa biasing element 119 for returning the substance supply unit 85 to therest position following actuation. With this configuration, the intervalbetween actuation of the gas supply unit 87 and the common actuation ofthe substance supply unit 85 and the gas supply unit 87 can becontrolled by altering the spacing between the drive member 97 and thebody of the substance supply unit 85.

Operation of the delivery device is the same as for the above-describedtenth embodiment.

FIGS. 57 to 62 illustrate an exhalation breath-actuated nasal deliverydevice in accordance with a twelfth embodiment of the present invention.

The delivery device of this embodiment is very similar to the deliverydevice of the above-described tenth embodiment, and thus, in order toavoid unnecessary duplication of description, only the differences willbe described in detail, with like reference signs designating likeparts.

The delivery device of this embodiment differs from that of theabove-described tenth embodiment only in the configuration of the outletunit 81 and in the integration of the substance supply unit 85 and thegas delivery unit 87.

In this embodiment the outlet unit 81 includes a second delivery channel120, here an annular channel which is disposed co-axially about thenozzle 82, through which an air flow from an exhalation breath of asubject is delivered, such as to entrain with the substance deliveredfrom the nozzle 82. In this embodiment the second delivery channel 120is fluidly connected to the mouthpiece 79 downstream. of the triggermechanism, and the mouthpiece 79 includes a pressure-release valve whichallows for the development of a flow above the release pressure of thepressure-release valve where a flow, or at least not a sufficient flow,cannot be developed through the nasal airway of the subject.

In this embodiment the substance supply unit 85 comprises a piston unitwhich is disposed within the chamber 93 of the gas supply unit 87. Thesubstance supply unit 85 comprises a cylinder 121 which defines achamber 122 and into one, forward end of which a hollow needle 123extends as an extension of the nozzle 82. The substance supply unit 85further comprises first and second pistons 124, 125 which contain avolume of substance therebetween and are movably disposed within thechamber 122.

With this configuration, the forward, piston 125 is driven forwardly onthe rear, piston 124 being driven forwardly, the substance containedbetween the pistons 124, 125 being substantially incompressible. Theforward piston 125 is a puncturable member which is punctured by theneedle 123 of the nozzle 82 on being driven onto the same, with theneedle 123 of the nozzle 82 being in fluid communication with thesubstance contained between the pistons 124, 125 on puncturing theforward piston 125.

In this embodiment the forward piston 125 of the substance supply unit85 is spaced from the needle 123 of the nozzle 82 by a predetermineddistance such that the piston 91 of the gas supply unit 87, which drivesthe rear piston 124 of the substance supply unit 85, is required to bedriven a predetermined distance before the forward piston 125 of thesubstance supply unit 85 is ruptured and substance is delivered throughthe nozzle 82. In this way, actuation of the gas supply unit 87 isinitiated prior to the actuation of the substance supply unit 85,whereby an interacting gas flow is delivered from the delivery channel83 of the outlet unit 81 prior to the delivery of substance from thenozzle 82 and then during the delivery of substance from the nozzle 82such as to interact with the same. In this embodiment the intervalbetween actuation of the gas supply unit 87 and the common actuation ofthe substance supply unit 85 and the gas supply unit 87 can becontrolled by altering the spacing between the forward piston 125 of thesubstance supply unit 85 and the needle 123 of the nozzle 82.

Operation of the delivery device is the same as for the above-describedtenth embodiment.

Finally, it will be understood that the present invention has beendescribed in its preferred embodiments and can be modified in manydifferent ways without departing from the scope of the invention asdefined by the appended claims.

In particular, it should be understood that features of any of theembodiments could be incorporated in any other of the embodiments. Forexample, the second and third embodiments could incorporate features ofthe first embodiment, in particular the at least one expandable cuffmember 23 as in the first embodiment.

Also, in embodiments where an entraining gas flow is not requiredthrough the nasal airways of subjects, ones of the embodiments could bemodified to include no such gas flow. For example, the first-describedembodiment could be modified such that the outlet unit 21 includes onlythe nozzle 23 and no delivery channel 23.

In the described embodiments the mouthpieces are configured to begripped in the lips of a subject. In alternative embodiments themouthpieces could be configured to be gripped by the teeth of a subjectand sealed by the lips of the subject. In preferred embodiments themouthpieces could be specifically configured to have one or both of ashape or geometry which allows the delivery devices to be grippedrepeatedly in the same position, thereby providing for the respectivenosepieces to be reliably inserted in the same position in the nasalcavity.

In preferred embodiments the delivery devices are configured to deliversubstance through one nostril of a subject at such a pressure as to flowaround the posterior margin of the nasal septum and out of the othernostril of the subject, thereby achieving bi-directional deliverythrough the nasal cavities as disclosed in WO-A-00/51672. In alternativeembodiments the delivery device could be configured to deliver substanceat a reduced pressure which is not sufficient to achieve bi-directionaldelivery through the nasal cavities. Such embodiments are stilladvantageous as compared to known delivery devices in providing forvelum closure and being capable of achieving targeted delivery,particularly when certain regions of the nasal cavity are obstructed bycuff members.

Also, in another modification, the delivery devices could include twonosepieces, in one embodiment configured for the simultaneous deliveryto each of the nasal cavities. Such embodiments would advantageouslyprovide for three-point fixation of the delivery devices via thenosepieces and the mouthpieces.

1-43. (canceled)
 44. A method of treating a neurological disorder, consisting of: a first step and, separately, a second step; wherein the first step includes delivering a first substance to the upper posterior, olfactory region of a nasal airway of a subject, which includes the olfactory bulb and the trigeminal nerve of the subject, wherein the first substance comprises from about 1 IU to about 100 IU of an active ingredient; and wherein the second step includes delivering a second substance to promote transfer of the first substance, wherein the second substance is a liquid and delivered after the first substance.
 45. The method of claim 44, wherein the first substance is a powder.
 46. The method of claim 45, wherein the first substance is mixed with a bulking agent.
 47. The method of claim 44, wherein the first substance is a liquid.
 48. The method of claim 44, wherein the first substance includes a thickening agent, which thickens on exposure to moisture.
 49. The method of claim 48, wherein the thickening agent comprises one or more of pectin, agar-agar, lignin, algin, gums and cellulose.
 50. The method of claim 44, wherein the first substance is administered once daily.
 51. The method of claim 44, wherein the first substance is administered twice daily.
 52. The method of claim 44, wherein the delivery of the first substance is targeted to provide for one or both of nose-to-brain (N2B) and systemic delivery of the first substance.
 53. The method of claim 52, wherein the delivery is targeted to provide for both nose-to-brain (N2B) and systemic delivery of the first substance, and the first substance is formulated to provide for greater N2B delivery than systemic delivery of the first substance.
 54. The method of claim 44, wherein the first substance comprises oxytocin.
 55. The method of claim 44, wherein the first substance further comprises a decongestant.
 56. The method of claim 44, wherein the first substance comprises less than about 20 IU of the active ingredient.
 57. The method of claim 44, wherein the first substance comprises less than about 15 IU of the active ingredient.
 58. The method of claim 44, wherein the first substance comprises less than about 10 IU of the active ingredient.
 59. The method of claim 44, wherein the first substance comprises less than about 5 IU of the active ingredient.
 60. The method of claim 44, wherein the first substance comprises from about 3 IU to about 10 IU of the active ingredient.
 61. The method of claim 44, wherein the first substance comprises from about 3 IU to about 5 IU of the active ingredient.
 62. The method of claim 44, wherein the first substance includes a second active ingredient.
 63. The method of claim 44, wherein the neurological disorder comprises Alzheimer's disease, Huntington's disease, Parkinson's disease, dementia, bi-polar disorder, obsessive-compulsive disorder (OCD), autism, eating disorder, addiction, schizophrenia, psychosis, post traumatic stress disorder (PTSD), depression and chronic depression. 